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DEBT, CREDIT FACILITIES, AND LEASE OBLIGATIONS - Summary of the Notes (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Amount $ 600.0    
Senior Notes      
Debt Instrument [Line Items]      
Amount 600.0   $ 600.0
Unamortized discount (1.3)   (0.5)
Unamortized debt issuance costs (4.9)   (0.8)
Hedge accounting fair value adjustments (see Note 11) 0.0   (0.7)
Total carrying amount $ 593.8   598.0
Fixed-rate 4.300% 2018 Notes | Senior Notes      
Debt Instrument [Line Items]      
Fixed interest rate 4.30%    
Amount $ 600.0   $ 0.0
Effective Interest Rate 4.329%   0.00%
Unamortized discount   $ (1.4)  
Fixed-rate 2.875% 2013 Notes | Senior Notes      
Debt Instrument [Line Items]      
Fixed interest rate 2.875%    
Amount $ 0.0   $ 600.0
Effective Interest Rate 0.00%   2.983%