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LONG-TERM OBLIGATIONS - 6-1/2% Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 03, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 27, 2012
Mar. 26, 2012
Debt Instrument [Line Items]            
Repayments of debt     $ 443.9 $ 1,585.0    
Senior Notes | 6-1/2% Notes            
Debt Instrument [Line Items]            
Interest rate (as a percent) 6.50% 6.50% 6.50%   6.50%  
Long-term debt           $ 300.0
Debt instrument, redemption price, percentage of principal amount redeemed 103.25%          
Repurchased face amount of debt $ 254.2 $ 45.8        
Repayments of debt 266.7 47.9        
Repurchase premium   1.2        
Interest payable 8.4 $ 0.9        
Call premium $ 4.1