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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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 317.5 $ 310.4 875.4 $ 778.6  
Other income, net 1.3 2.7 6.4 5.3  
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) 3.0 (5.4)  
Other income, net 2.2 $ 1.8 6.6 $ 5.4  
Other Current Assets          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Restricted cash and cash equivalents 19.7   19.7    
Other Current Liabilities          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Restricted cash and cash equivalents $ 19.7   $ 19.7