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DEBT - Schedule of Long Term Debt (Details) - Total senior notes - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total senior notes $ 1,200.0 $ 600.0
Unamortized discount (1.6) (0.5)
Unamortized debt issuance costs (5.0) (0.8)
Hedge accounting fair value adjustments (see Note 8) (0.3) (0.7)
Total carrying amount $ 1,193.1 598.0
Fixed-rate 4.300% notes    
Debt Instrument [Line Items]    
Stated interest rate 4.30%  
Total senior notes $ 600.0 $ 0.0
Unamortized discount $ (1.4)  
Effective Interest Rate 4.329% 0.00%
Fixed-rate 2.875% notes    
Debt Instrument [Line Items]    
Stated interest rate 2.875%  
Total senior notes $ 600.0 $ 600.0
Effective Interest Rate 2.983% 2.983%