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STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gains (Losses) on Hedge Instruments        
Beginning balance $ (3.2) $ 1.1 $ (2.4) $ 5.0
Other comprehensive income (loss) before reclassifications 6.2 (3.0) 3.2 (5.1)
Amounts reclassified from accumulated other comprehensive income (loss) 0.4 0.0 2.6 (1.8)
Net current-period other comprehensive income (loss) 6.6 (3.0) 5.8 (6.9)
Ending balance 3.4 (1.9) 3.4 (1.9)
Unrealized Gains (Losses) on Available-for-Sale Securities        
Beginning balance (17.5) (5.8) (11.3) (8.6)
Other comprehensive income (loss) before reclassifications 0.8 0.4 (6.6) 3.3
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.1 1.2 0.0
Net current-period other comprehensive income (loss) 0.8 0.5 (5.4) 3.3
Ending balance (16.7) (5.3) (16.7) (5.3)
Foreign Currency Translation Gains (Losses)        
Beginning balance 6.8 0.5 2.3 (1.3)
Other comprehensive income (loss) before reclassifications (5.9) 0.5 (1.4) 2.3
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.0 0.0
Net current-period other comprehensive income (loss) (5.9) 0.5 (1.4) 2.3
Ending balance 0.9 1.0 0.9 1.0
Employee Benefit Plans        
Beginning balance (4.2) (3.8) (4.1) (4.0)
Other comprehensive income (loss) before reclassifications (0.3) 0.0 0.0 0.1
Amounts reclassified from accumulated other comprehensive income (loss) 0.5 0.2 0.1 0.3
Net current-period other comprehensive income (loss) 0.2 0.2 0.1 0.4
Ending balance (4.0) (3.6) (4.0) (3.6)
Total        
Beginning balance (18.1) (8.0) (15.5) (8.9)
Other comprehensive income (loss) before reclassifications 0.8 (2.1) (4.8) 0.6
Amounts reclassified from accumulated other comprehensive income (loss) 0.9 0.3 3.9 (1.5)
Net current-period other comprehensive income (loss) 1.7 (1.8) (0.9) (0.9)
Ending balance $ (16.4) $ (9.8) $ (16.4) $ (9.8)
Shares withheld related to net share settlement of equity awards 5.2   101.9