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LONG-TERM OBLIGATIONS - 6-1/2% Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 03, 2017
Mar. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Mar. 26, 2012
Debt Instrument [Line Items]          
Repayments of debt     $ 1,593.0 $ 1,004.8  
Senior Notes | 6-1/2% Notes          
Debt Instrument [Line Items]          
Interest rate (as a percent) 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