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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Gains (Losses) on Hedge Instruments
Beginning balance	$ 3.1	$ 0.4	$ (2.9)	$ 0.7
Other comprehensive income (loss) before reclassifications	4.2	(0.8)	9.3	2.0
Amounts reclassified from accumulated other comprehensive income (loss)	(2.2)	(0.6)	(1.3)	(3.7)
Net current-period other comprehensive income (loss)	2.0	(1.4)	8.0	(1.7)
Ending balance	5.1	(1.0)	5.1	(1.0)
Unrealized Gains (Losses) on Available-for-Sale Securities
Beginning balance	13.5	44.1	29.5	20.4
Other comprehensive income (loss) before reclassifications	(3.4)	(7.1)	(19.4)	21.3
Amounts reclassified from accumulated other comprehensive income (loss)	(1.1)	0.0	(1.1)	(4.7)
Net current-period other comprehensive income (loss)	(4.5)	(7.1)	(20.5)	16.6
Ending balance	9.0	37.0	9.0	37.0
Foreign Currency Translation Gains (Losses)
Beginning balance	(0.1)	(13.8)	4.7	0.0
Other comprehensive income (loss) before reclassifications	(2.7)	2.2	(7.5)	(11.6)
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0	0.0
Net current-period other comprehensive income (loss)	(2.7)	2.2	(7.5)	(11.6)
Ending balance	(2.8)	(11.6)	(2.8)	(11.6)
Employee Benefit Plans
Beginning balance	(6.2)	(8.4)	(6.4)	(8.7)
Other comprehensive income (loss) before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	0.2	0.4	0.5
Net current-period other comprehensive income (loss)	0.2	0.2	0.4	0.5
Ending balance	(6.0)	(8.2)	(6.0)	(8.2)
Total
Beginning balance	10.3	22.3	24.9	12.4
Other comprehensive income (loss) before reclassifications	(1.9)	(5.7)	(17.6)	11.7
Amounts reclassified from accumulated other comprehensive income (loss)	(3.1)	(0.4)	(2.0)	(7.9)
Net current-period other comprehensive income (loss)	(5.0)	(6.1)	(19.6)	3.8
Ending balance	$ 5.3	$ 16.2	$ 5.3	$ 16.2

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