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LONG-TERM OBLIGATIONS - Additional Information (Details)
$ / shares in Units, € in Millions, shares in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 17, 2017
Apr. 03, 2017
USD ($)
Jun. 01, 2015
USD ($)
shares
Mar. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Jan. 31, 2017
USD ($)
May 28, 2015
USD ($)
Aug. 13, 2014
USD ($)
Aug. 13, 2014
EUR (€)
Nov. 26, 2012
USD ($)
Mar. 27, 2012
Mar. 26, 2012
USD ($)
Jun. 03, 2009
USD ($)
Nov. 13, 2007
USD ($)
Debt Instrument [Line Items]                                  
Gain (loss) on extinguishment of debt           $ (52,600,000) $ (400,000) $ (100,000)                  
Long-term debt           981,700,000                      
Repayments of debt           1,594,100,000 1,286,300,000 1,397,800,000                  
Interest paid           $ 59,500,000 $ 96,200,000 $ 98,900,000                  
Common stock, par value (in dollars per share) | $ / shares           $ 0.01 $ 0.01 $ 0.01                  
Credit Agreement 2017                                  
Debt Instrument [Line Items]                                  
Gain (loss) on extinguishment of debt           $ (700,000)                      
Debt instrument collateral percentage of material subsidiaries capital stock                 65.00%                
Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Long-term debt             $ 0                    
Credit Agreement 2014                                  
Debt Instrument [Line Items]                                  
Revolving line of credit available borrowing capacity                     $ 600,000,000            
Long-term debt             $ 428,600,000                    
Weighted average interest rate             3.63%                    
Letters of credit outstanding           0                      
Letters of credit maximum available under additional facilities                     $ 300,000,000            
Debt instrument collateral percentage of material subsidiaries capital stock                     65.00% 65.00%          
Letters of credit maximum available under credit facility                     $ 400,000,000            
2014 Credit Agreement and 2011 Credit Agreement                                  
Debt Instrument [Line Items]                                  
Gain (loss) on extinguishment of debt           (8,200,000)   $ (100,000)                  
2014 Credit Agreement Additional LC Arrangements                                  
Debt Instrument [Line Items]                                  
Letters of credit outstanding             $ 36,800,000                    
Bilateral LC Arrangements                                  
Debt Instrument [Line Items]                                  
Letters of credit outstanding             146,400,000                    
Bilateral LC Arrangements | Discontinued Operations                                  
Debt Instrument [Line Items]                                  
Letters of credit outstanding             121,400,000                    
Senior Notes Due April 2065 | Merger                                  
Debt Instrument [Line Items]                                  
Indenture amendment, bondholder consent fees           1,100,000                      
6-1/2% Senior Notes due April 1, 2020                                  
Debt Instrument [Line Items]                                  
Long-term debt             300,000,000                    
Interest rate of debt securities (as a percent)                           6.50%      
Indenture amendment, costs incurred to date             400,000                    
6% Senior Notes due May 15, 2021                                  
Debt Instrument [Line Items]                                  
Long-term debt             850,000,000                    
Indenture amendment, costs incurred to date             1,100,000                    
6% Senior Notes due May 15, 2021 | Merger                                  
Debt Instrument [Line Items]                                  
Indenture amendment, bondholder consent fees           3,100,000                      
Securitization 2015                                  
Debt Instrument [Line Items]                                  
Revolving line of credit available borrowing capacity                   $ 350,000,000              
Write off of deferred debt issuance cost           400,000                      
Commitment Letter                                  
Debt Instrument [Line Items]                                  
Professional fees             7,200,000                    
Credit Agreement | Credit Agreement 2017                                  
Debt Instrument [Line Items]                                  
Incremental borrowing capacity                 $ 300,000,000                
Long-term debt           389,000,000 0                    
Credit Agreement | Credit Agreement 2017 | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Revolving line of credit available borrowing capacity                 $ 450,000,000                
Long-term line of credit           $ 0                      
Springing covenant threshold                 30.00%                
Minimum interest coverage ratio           2.5                      
Senior secured debt leverage ratio maximum           2.75                      
Credit Agreement | Credit Agreement 2017 | Secured Debt                                  
Debt Instrument [Line Items]                                  
Long-term line of credit                 $ 400,000,000                
Interest rate increase (decrease) 0.25%                                
Long-term debt           $ 395,100,000                      
Weighted average interest rate           3.94%                      
Credit Agreement | Credit Agreement 2017 | Letter of Credit                                  
Debt Instrument [Line Items]                                  
Letters of credit outstanding           $ 57,400,000                      
Credit Agreement | Credit Agreement 2014                                  
Debt Instrument [Line Items]                                  
Long-term debt           $ 0 420,700,000                    
Credit Agreement | Credit Agreement 2014 | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Springing covenant threshold                     30.00% 30.00%          
Minimum interest coverage ratio           2.5                      
Letters of credit outstanding             183,200,000                    
Credit Agreement | Credit Agreement 2014 | Secured Debt                                  
Debt Instrument [Line Items]                                  
Long-term line of credit                     $ 230,000,000 € 200.0          
Senior secured debt leverage ratio maximum           2.75                      
Credit Agreement | Credit Agreement 2014 | Letter of Credit                                  
Debt Instrument [Line Items]                                  
Letters of credit outstanding             0                    
Credit Agreement | Credit Agreement 2014 | Letter of Credit | Discontinued Operations                                  
Debt Instrument [Line Items]                                  
Letters of credit outstanding             121,400,000                    
Credit Agreement | Additional Credit Agreement 2017 | Letter of Credit                                  
Debt Instrument [Line Items]                                  
Letters of credit outstanding           $ 34,300,000                      
Letters of credit maximum available under additional facilities                 300,000,000                
Credit Agreement | Bilateral Arrangements 2017 Credit Agreement | Letter of Credit                                  
Debt Instrument [Line Items]                                  
Letters of credit outstanding           23,100,000                      
Senior Notes                                  
Debt Instrument [Line Items]                                  
Gain (loss) on extinguishment of debt         $ (43,700,000)                        
Senior Notes | 6.5% Senior Notes                                  
Debt Instrument [Line Items]                                  
Long-term debt                             $ 300,000,000    
Redemption price, percentage of principal amount redeemed         103.25%                        
Repurchased face amount   $ 254,200,000   $ 45,800,000                          
Repayments of debt   266,700,000   47,900,000                          
Repurchase premium       1,200,000                          
Interest payable   8,400,000   900,000                          
Call premium   $ 4,100,000                              
Senior Notes | 6-1/2% Senior Notes due April 1, 2020                                  
Debt Instrument [Line Items]                                  
Long-term debt           $ 0 297,900,000                    
Interest rate of debt securities (as a percent)           6.50%                      
Senior Notes | 6% Senior Notes due May 15, 2021                                  
Debt Instrument [Line Items]                                  
Long-term debt           $ 0 842,500,000           $ 850,000,000       $ 800,000,000
Interest rate of debt securities (as a percent)           6.00%             6.00%        
Repayments of debt       887,200,000                          
Repurchase premium       25,900,000                          
Interest payable       $ 11,300,000                          
Authorized repurchase amount                 550,000,000                
Senior Notes | 8% Senior Subordinated Notes due November 15, 2017                                  
Debt Instrument [Line Items]                                  
Interest rate of debt securities (as a percent)                                 8.00%
Senior Notes | 5-5/8% Senior Notes due February 1, 2025                                  
Debt Instrument [Line Items]                                  
Long-term debt           $ 589,600,000 $ 0                    
Debt instrument, face amount                 600,000,000                
Senior Notes | Senior Notes, 6%, $300 Million Partial Redemption                                  
Debt Instrument [Line Items]                                  
Authorized repurchase amount                 $ 300,000,000                
Convertible Subordinated Debt | 4% Convertible Senior Subordinated Notes [Member]                                  
Debt Instrument [Line Items]                                  
Long-term debt                               $ 172,500,000  
Interest rate of debt securities (as a percent)                               4.00%  
Convertible debt instrument, carrying amount of equity component                               $ 54,300,000  
Convertible deferred tax liability on equity component                               $ 19,400,000  
Repayments of debt     $ 131,100,000                            
Long-term debt maturity value     128,800,000                            
Interest expense, cebt               $ 5,700,000                  
Interest paid     $ 2,300,000                            
Shares issued (in shares) | shares     3.4