Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)

v3.10.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Fair value of long-term debt $ 2,700.0   $ 2,700.0   $ 2,100.0
Carrying value of long-term debt 2,700.0   2,700.0   2,100.0
Impact of Tax Cuts and Jobs Act of 2017 0.0   0.0   (50.0)
Selling, general and administrative expenses 257.5 $ 226.6 558.0 $ 468.1  
Other income, net 2.2 1.3 5.1 2.6  
Accounting Standards Update 2018-02          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Impact of Tax Cuts and Jobs Act of 2017         $ 50.0
Accounting Standards Update 2017-07          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Selling, general and administrative expenses 1.0 (1.8) 2.0 (3.6)  
Other income, net 2.2 $ 1.8 4.4 $ 3.6  
Other Current Assets          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Restricted cash and cash equivalents 24.8   24.8    
Other Current Liabilities          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Restricted cash and cash equivalents $ 24.8   $ 24.8