Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Amounts Recognized in Other Comprehensive Income (Loss) (Details)

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BENEFIT PLANS - Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amounts recognized in net periodic benefit cost during the period:      
Total recognized in other comprehensive income $ (19.0) $ (10.4) $ (8.4)
Pension Benefits      
Amounts arising during the period:      
Net actuarial loss (gain), net of taxes of $1.7 in 2019 and $2.6 in 2018, respectively, for pension benefits and $(1.8) in 2019 and $0.0 in 2018, respectively, for other benefits 1.4 6.6  
Foreign currency exchange rate gain, net of taxes of $0.1 in 2019 and $(0.1) in 2018, respectively, for pension benefits and $0.0 in 2019 and $0.0 in 2018, respectively, for other benefits 0.2 (0.2)  
Prior service cost, net of taxes of $(0.7) in 2019 and $0.0 in 2018, respectively, for pension benefits and $0.0 in 2019 and $0.0 in 2018, respectively for other benefits 5.2 0.0  
Amounts recognized in net periodic benefit cost during the period:      
Recognized actuarial loss, net of taxes of $(3.7) and $(4.8) in 2019 and 2018, respectively, for pension benefits and $(0.3) in 2019 and 2018, respectively, for other benefits (11.5) (14.9)  
Amortization of prior service cost, net of taxes of $(0.1) in 2019 and 2018, for pension benefits and $0.2 in 2019 and $0.2 in 2018 for other benefits (0.4) (0.4)  
Curtailments, net of taxes of $(0.1) in 2019 for pension benefits (0.2) 0.0  
Total recognized in other comprehensive income (15.7) (8.9)  
Net actuarial loss (gain), taxes 1.7 2.6  
Foreign currency exchange rate (gain) loss, taxes 0.1 (1.0)  
Recognized actuarial loss, taxes (3.7) (4.8)  
Prior service cost, tax (0.7) 0.0  
Amortization of prior service cost, taxes (0.1) (0.1)  
Curtailments, tax (0.1)    
Other Benefits      
Amounts arising during the period:      
Net actuarial loss (gain), net of taxes of $1.7 in 2019 and $2.6 in 2018, respectively, for pension benefits and $(1.8) in 2019 and $0.0 in 2018, respectively, for other benefits (3.2) (1.5)  
Foreign currency exchange rate gain, net of taxes of $0.1 in 2019 and $(0.1) in 2018, respectively, for pension benefits and $0.0 in 2019 and $0.0 in 2018, respectively, for other benefits 0.1 0.3  
Prior service cost, net of taxes of $(0.7) in 2019 and $0.0 in 2018, respectively, for pension benefits and $0.0 in 2019 and $0.0 in 2018, respectively for other benefits 0.0 0.0  
Amounts recognized in net periodic benefit cost during the period:      
Recognized actuarial loss, net of taxes of $(3.7) and $(4.8) in 2019 and 2018, respectively, for pension benefits and $(0.3) in 2019 and 2018, respectively, for other benefits (1.0) (1.1)  
Amortization of prior service cost, net of taxes of $(0.1) in 2019 and 2018, for pension benefits and $0.2 in 2019 and $0.2 in 2018 for other benefits 0.8 0.8  
Curtailments, net of taxes of $(0.1) in 2019 for pension benefits 0.0 0.0  
Total recognized in other comprehensive income (3.3) (1.5)  
Net actuarial loss (gain), taxes (1.8) 0.0  
Foreign currency exchange rate (gain) loss, taxes 0.0 0.0  
Recognized actuarial loss, taxes (0.3) (0.3)  
Prior service cost, tax 0.0 0.0  
Amortization of prior service cost, taxes $ 0.2 $ 0.2