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STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Gains (Losses) on Hedge Instruments        
Beginning balance $ 0.5 $ 3.4 $ 0.2 $ (2.4)
Other comprehensive income (loss) before reclassifications 4.1 1.4 7.4 4.6
Amounts reclassified from accumulated other comprehensive income (loss) (1.0) (1.1) (4.0) 1.5
Net current-period other comprehensive income (loss) 3.1 0.3 3.4 6.1
Ending balance 3.6 3.7 3.6 3.7
Unrealized Gains (Losses) on Available-for-Sale Securities        
Beginning balance 19.7 (16.7) (9.8) (11.3)
Other comprehensive income (loss) before reclassifications 1.7 0.6 31.3 (6.0)
Amounts reclassified from accumulated other comprehensive income (loss) (0.2) (0.1) (0.3) 1.1
Net current-period other comprehensive income (loss) 1.5 0.5 31.0 (4.9)
Ending balance 21.2 (16.2) 21.2 (16.2)
Foreign Currency Translation Gains (Losses)        
Beginning balance (0.8) 0.9 (0.3) 2.3
Other comprehensive income (loss) before reclassifications (3.0) (1.2) (3.5) (2.6)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.0 0.0
Net current-period other comprehensive income (loss) (3.0) (1.2) (3.5) (2.6)
Ending balance (3.8) (0.3) (3.8) (0.3)
Employee Benefit Plans        
Beginning balance (3.3) (4.0) (3.4) (4.1)
Other comprehensive income (loss) before reclassifications 0.0 0.0 (0.1) 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 0.1 0.3 0.2
Net current-period other comprehensive income (loss) 0.1 0.1 0.2 0.2
Ending balance (3.2) (3.9) (3.2) (3.9)
Total        
Beginning balance 16.1 (16.4) (13.3) (15.5)
Other comprehensive income (loss) before reclassifications 2.8 0.8 35.1 (4.0)
Amounts reclassified from accumulated other comprehensive income (loss) (1.1) (1.1) (4.0) 2.8
Net current-period other comprehensive income (loss) 1.7 (0.3) 31.1 (1.2)
Ending balance $ 17.8 $ (16.7) $ 17.8 $ (16.7)