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STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Gains (Losses) on Hedge Instruments    
Beginning balance $ 0.2 $ (2.4)
Other comprehensive income (loss) before reclassifications 3.5 (3.0)
Amounts reclassified from accumulated other comprehensive income (loss) (2.1) 2.2
Net current-period other comprehensive income (loss) 1.4 (0.8)
Ending balance 1.6 (3.2)
Unrealized Gains (Losses) on Available-for-Sale Securities    
Beginning balance (9.8) (11.3)
Other comprehensive income (loss) before reclassifications 11.6 (7.4)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 1.2
Net current-period other comprehensive income (loss) 11.6 (6.2)
Ending balance 1.8 (17.5)
Foreign Currency Translation Gains (Losses)    
Beginning balance (0.3) 2.3
Other comprehensive income (loss) before reclassifications (0.4) 4.5
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Net current-period other comprehensive income (loss) (0.4) 4.5
Ending balance (0.7) 6.8
Employee Benefit Plans    
Beginning balance (3.4) (4.1)
Other comprehensive income (loss) before reclassifications (0.1) 0.3
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 (0.4)
Net current-period other comprehensive income (loss) 0.0 (0.1)
Ending balance (3.4) (4.2)
Total    
Beginning balance (13.3) (15.5)
Other comprehensive income (loss) before reclassifications 14.6 (5.6)
Amounts reclassified from accumulated other comprehensive income (loss) (2.0) 3.0
Net current-period other comprehensive income (loss) 12.6 (2.6)
Ending balance $ (0.7) $ (18.1)