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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Change in AOCI by component (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated other comprehensive loss      
Balance at the beginning of the period $ 38.7    
Realized gain (loss) on foreign currency transactions reclassified into investment expense (income), net of tax (0.4) $ 1.9 $ 0.5
Balance at the end of period (28.1) 38.7  
Accumulated Other Comprehensive Income (Loss)      
Accumulated other comprehensive loss      
Balance at the beginning of the period 38.7 (26.1)  
Other comprehensive income (loss) before reclassifications   62.9  
Amounts reclassified from accumulated other comprehensive loss   1.9  
Other comprehensive income (loss) (66.4)    
Realized gain (loss) on foreign currency transactions reclassified into investment expense (income), net of tax (0.4)    
Balance at the end of period (28.1) 38.7 (26.1)
Foreign Currency      
Accumulated other comprehensive loss      
Balance at the beginning of the period 60.1 (8.8)  
Other comprehensive income (loss) before reclassifications (78.9) 67.0 (16.5)
Amounts reclassified from accumulated other comprehensive loss   1.9  
Other comprehensive income (loss) (78.7)    
Realized gain (loss) on foreign currency transactions reclassified into investment expense (income), net of tax (0.4)    
Balance at the end of period (19.0) 60.1 (8.8)
Pension and Other Benefits (recorded in G&A : Other)      
Accumulated other comprehensive loss      
Balance at the beginning of the period (21.4) (17.3)  
Other comprehensive income (loss) before reclassifications   (4.1)  
Other comprehensive income (loss) 12.3    
Balance at the end of period $ (9.1) $ (21.4) (17.3)
Unrealized Loss from Equity Method Investees' Cash Flow Hedge      
Accumulated other comprehensive loss      
Other comprehensive income (loss) before reclassifications     $ (0.1)