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, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized in net periodic benefit cost during the period:      
Total recognized in other comprehensive income $ (10.4) $ (8.4) $ 20.1
Pension Benefits      
Amounts arising during the period:      
Net actuarial loss (gain), net of taxes of $2.6 in 2018 and $0.0 in 2017, respectively, for pension benefits and $0.0 in 2018 and $0.1 in 2017, respectively, for other benefits 6.6 2.5  
Foreign currency exchange rate gain, net of taxes of ($0.1) in 2018 and $(1.2) in 2017, respectively, for pension benefits and $0.0 in 2018 and 2017, respectively, for other benefits (0.2) (0.4)  
Amounts recognized in net periodic benefit cost during the period:      
Recognized actuarial loss, net of taxes of $(4.8) and $(3.7) in 2018 and 2017, respectively, for pension benefits and $(0.3) in 2018 and 2017, respectively, for other benefits (14.9) (11.8)  
Amortization of prior service cost, net of taxes of $(0.1) 2018 and 2017, for pension benefits and $0.2 in 2018 and 2017 for other benefits (0.4) (0.5)  
Total recognized in other comprehensive income (8.9) (10.2)  
Net actuarial loss (gain), taxes 2.6 0.0  
Foreign currency exchange rate (gain) loss, taxes (0.1) (1.2)  
Recognized actuarial loss, taxes (4.8) (3.7)  
Amortization of prior service cost, taxes (0.1) (0.1)  
Other Benefits      
Amounts arising during the period:      
Net actuarial loss (gain), net of taxes of $2.6 in 2018 and $0.0 in 2017, respectively, for pension benefits and $0.0 in 2018 and $0.1 in 2017, respectively, for other benefits (1.5) 0.9  
Foreign currency exchange rate gain, net of taxes of ($0.1) in 2018 and $(1.2) in 2017, respectively, for pension benefits and $0.0 in 2018 and 2017, respectively, for other benefits 0.3 1.1  
Amounts recognized in net periodic benefit cost during the period:      
Recognized actuarial loss, net of taxes of $(4.8) and $(3.7) in 2018 and 2017, respectively, for pension benefits and $(0.3) in 2018 and 2017, respectively, for other benefits (1.1) (1.0)  
Amortization of prior service cost, net of taxes of $(0.1) 2018 and 2017, for pension benefits and $0.2 in 2018 and 2017 for other benefits 0.8 0.8  
Total recognized in other comprehensive income (1.5) 1.8  
Net actuarial loss (gain), taxes 0.0 0.1  
Foreign currency exchange rate (gain) loss, taxes 0.0 0.0  
Recognized actuarial loss, taxes (0.3) (0.3)  
Amortization of prior service cost, taxes $ 0.2 $ 0.2