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STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ (162.5) $ (24.2)
Other comprehensive income (loss) before reclassifications 55.4 (84.0)
Amounts reclassified from accumulated other comprehensive income (loss) (1.4) (2.5)
Net current-period other comprehensive income (loss) 54.0 (86.5)
Ending balance (108.5) (110.7)
Gains (Losses) on Hedge Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (2.9) 4.5
Other comprehensive income (loss) before reclassifications 3.7 3.7
Amounts reclassified from accumulated other comprehensive income (loss) (1.2) (2.7)
Net current-period other comprehensive income (loss) 2.5 1.0
Ending balance (0.4) 5.5
Unrealized Gains (Losses) on Available-for-Sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (154.2) (16.0)
Other comprehensive income (loss) before reclassifications 37.8 (90.8)
Amounts reclassified from accumulated other comprehensive income (loss) (0.2) 0.1
Net current-period other comprehensive income (loss) 37.6 (90.7)
Ending balance (116.6) (106.7)
Foreign Currency Translation Gains (Losses)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (6.6) (7.9)
Other comprehensive income (loss) before reclassifications 13.9 3.1
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Net current-period other comprehensive income (loss) 13.9 3.1
Ending balance 7.3 (4.8)
Employee Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 1.2 (4.8)
Other comprehensive income (loss) before reclassifications 0.0 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.1
Net current-period other comprehensive income (loss) 0.0 0.1
Ending balance $ 1.2 $ (4.7)