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LONG-TERM OBLIGATIONS - Debt Summary Table (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Jan. 31, 2017
Dec. 31, 2016
Nov. 26, 2012
Mar. 27, 2012
Nov. 13, 2007
Debt Instrument [Line Items]            
Debt Issuance Costs, Net $ 16.5          
Long-term debt 981.7          
Total debt 984.8   $ 1,575.8      
Notes payable and current portion of long-term debt (5.2)   (13.8)      
Long-term debt, less current portion 979.6   1,562.0      
6-1/2% Senior Notes due April 1, 2020            
Debt Instrument [Line Items]            
Interest rate of debt securities (as a percent)         6.50%  
Long-term debt     300.0      
6% Senior Notes due May 15, 2021            
Debt Instrument [Line Items]            
Long-term debt     850.0      
Credit Agreement 2014            
Debt Instrument [Line Items]            
Long-term debt     428.6      
Senior Notes | 5-5/8% Senior Notes due February 1, 2025            
Debt Instrument [Line Items]            
Long-term debt $ 589.6   0.0      
Senior Notes | 6-1/2% Senior Notes due April 1, 2020            
Debt Instrument [Line Items]            
Interest rate of debt securities (as a percent) 6.50%          
Debt Issuance Costs, Net $ 0.0   2.1      
Long-term debt $ 0.0   297.9      
Senior Notes | 6% Senior Notes due May 15, 2021            
Debt Instrument [Line Items]            
Interest rate of debt securities (as a percent) 6.00%     6.00%    
Debt Issuance Costs, Net $ 0.0   7.5      
Long-term debt 0.0   842.5 $ 850.0   $ 800.0
Senior Notes | Senior Notes Due 2025 5 5/8 Percent [Member]            
Debt Instrument [Line Items]            
Interest rate of debt securities (as a percent)   5.625%        
Credit Agreement | Credit Agreement 2017            
Debt Instrument [Line Items]            
Long-term debt 389.0   0.0      
Credit Agreement | Credit Agreement 2014            
Debt Instrument [Line Items]            
Debt Issuance Costs, Net 0.0   7.9      
Long-term debt 0.0   420.7      
Capital Lease Obligations            
Debt Instrument [Line Items]            
Capital lease obligations 3.1   2.9      
Other Debt Obligations            
Debt Instrument [Line Items]            
Long-term debt $ 3.1   $ 11.8