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LONG-TERM DEBT - Additional information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Long Term Debt    
Outstanding borrowings $ 714.5 $ 780.5
Senior unsecured notes - due November 15, 2022    
Long Term Debt    
Outstanding borrowings 397.4 495.3
Notional amount $ 400.3  
Borrowings, interest rate 6.25%  
Principal amount repurchased and cancelled $ 99.7  
Principal amount repurchased and cancelled, transaction costs $ 0.3  
Interest Coverage Ratio minimum interest coverage incurrence covenant of earnings before interest, taxes, depreciation, amortization, impairment, and other non-cash adjustments to interest of 2:1.  
Transaction Costs Capitalized $ 9.9  
Senior unsecured notes - due May 15, 2025    
Long Term Debt    
Outstanding borrowings 287.1 285.2
Notional amount $ 300.0 $ 300.0
Borrowings, interest rate 6.375%  
Interest Coverage Ratio minimum interest coverage incurrence covenant of earnings before interest, taxes, depreciation, amortization, impairment, and other non-cash adjustments to interest of 2:1  
Borrowing costs incurred $ 10.7  
Borrowings Redemption Price Percentage 100.00%  
Credit Facility    
Long Term Debt    
Standby fees on undrawn amounts under credit facility, Percentage 0.73% 0.73%
Letters Of Credit Issued $ 118.9 $ 110.8
Credit Facility Full Interest Rate 3.25% 3.25%
Increase Decrease The Capacity for Credit Facility $ 400.0  
Proceeds from non-current borrowings $ 30.0  
Credit Facility | Bottom of range [member]    
Long Term Debt    
Standby fees on undrawn amounts under credit facility, Percentage 0.51%  
Credit Facility Full Interest Rate 1.25%  
Credit Facility | Top of range [member]    
Long Term Debt    
Standby fees on undrawn amounts under credit facility, Percentage 0.84%  
Credit Facility Full Interest Rate 3.75%