Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)

v3.8.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Fair value of long-term debt $ 2,100.0   $ 2,100.0
Carrying value of long-term debt 2,100.0   2,100.0
Impact of Tax Cuts and Jobs Act of 2017 0.0   (50.0)
Selling, general and administrative expenses 300.5 $ 241.5  
Other income, net 2.9 1.3  
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)  
Other income, net 2.2 $ 1.8  
Other Current Assets      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Restricted cash and cash equivalents 21.8    
Other Current Liabilities      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Restricted cash and cash equivalents $ 21.8