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DEBT - Schedule of Long Term Debt (Details) - Total senior notes - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Total senior notes $ 1,200.0   $ 600.0
Unamortized discount (1.4)   (0.5)
Unamortized debt issuance costs (5.1)   (0.8)
Hedge accounting fair value adjustments (see Note 8) 0.0   (0.7)
Total carrying amount $ 1,193.5   598.0
Fixed-rate 4.300% 2018 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% 2013 Notes      
Debt Instrument [Line Items]      
Stated interest rate 2.875%    
Total senior notes $ 600.0   $ 600.0
Effective Interest Rate 2.983%   2.983%