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STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Gains (Losses) on Hedge Instruments    
Beginning balance $ 0.7 $ 0.2
Other comprehensive income (loss) before reclassifications 2.8 3.5
Amounts reclassified from accumulated other comprehensive income (loss) (1.7) (2.1)
Net current-period other comprehensive income (loss) 1.1 1.4
Ending balance 1.8 1.6
Unrealized Gains (Losses) on Available-for-Sale Securities    
Beginning balance 20.4 (9.8)
Other comprehensive income (loss) before reclassifications 16.8 11.6
Amounts reclassified from accumulated other comprehensive income (loss) (1.0) 0.0
Net current-period other comprehensive income (loss) 15.8 11.6
Ending balance 36.2 1.8
Foreign Currency Translation Gains (Losses)    
Beginning balance 0.0 (0.3)
Other comprehensive income (loss) before reclassifications (20.6) (0.4)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Net current-period other comprehensive income (loss) (20.6) (0.4)
Ending balance (20.6) (0.7)
Employee Benefit Plans    
Beginning balance (8.7) (3.4)
Other comprehensive income (loss) before reclassifications 0.0 (0.1)
Amounts reclassified from accumulated other comprehensive income (loss) 0.2 0.1
Net current-period other comprehensive income (loss) 0.2 0.0
Ending balance (8.5) (3.4)
Total    
Beginning balance 12.4 (13.3)
Other comprehensive income (loss) before reclassifications (1.0) 14.6
Amounts reclassified from accumulated other comprehensive income (loss) (2.5) (2.0)
Net current-period other comprehensive income (loss) (3.5) 12.6
Ending balance $ 8.9 $ (0.7)