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LONG-TERM OBLIGATIONS - 5-5/8% Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Apr. 03, 2017
Jan. 31, 2017
Nov. 26, 2012
Mar. 27, 2012
Mar. 26, 2012
Nov. 13, 2007
Debt Instrument [Line Items]                
Loss on early extinguishment of debt $ 0.7 $ 45.4            
Senior Notes                
Debt Instrument [Line Items]                
Loss on early extinguishment of debt   $ 37.2            
Senior Notes | 5-5/8% Notes                
Debt Instrument [Line Items]                
Face amount of debt       $ 600.0        
Interest rate (as a percent) 5.625%     5.625%        
Long-term debt $ 600.0              
Senior Notes | 6% Notes                
Debt Instrument [Line Items]                
Interest rate (as a percent) 6.00% 6.00%   6.00% 6.00%      
Tender offer for face amount of debt       $ 550.0        
Long-term debt         $ 850.0     $ 800.0
Senior Notes | Senior Notes, 6%, $300 Million Partial Redemption                
Debt Instrument [Line Items]                
Authorized repurchase amount       $ 300.0        
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