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LONG-TERM OBLIGATIONS - Schedule of Fair Value (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Nov. 26, 2012
Nov. 13, 2007
Debt Instrument [Line Items]          
Book Value   $ 981.7      
6-1/2% Senior Notes          
Debt Instrument [Line Items]          
Book Value $ 300.0        
Quote $ 1.02500        
Fair Value $ 308.0        
6% Senior Notes          
Debt Instrument [Line Items]          
Book Value $ 850.0        
Quote $ 1.02750        
Fair Value $ 873.0        
2014 Credit Agreement Term Loan (net of discount) – USD          
Debt Instrument [Line Items]          
Book Value $ 223.5        
Quote $ 1.00000        
Fair Value $ 224.0        
2014 Credit Agreement Term Loan (net of discount) – EUR          
Debt Instrument [Line Items]          
Book Value $ 205.1        
Quote $ 0.99500        
Fair Value $ 204.0        
Senior Notes | 5-5/8% Notes          
Debt Instrument [Line Items]          
Book Value 0.0 589.6      
Fair Value   624.0      
Senior Notes | 6-1/2% Senior Notes          
Debt Instrument [Line Items]          
Book Value 297.9 0.0      
Senior Notes | 6% Senior Notes          
Debt Instrument [Line Items]          
Book Value 842.5 0.0   $ 850.0 $ 800.0
Credit Agreement | 2017 Credit Agreement Term Loan (net of discount)          
Debt Instrument [Line Items]          
Book Value $ 0.0 389.0      
Credit Agreement | Secured Debt | 2017 Credit Agreement Term Loan (net of discount)          
Debt Instrument [Line Items]          
Book Value   $ 395.1      
Fair Value     $ 398.0