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Stockholders' Equity - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 8,263.8
Other comprehensive income (loss) before reclassifications	18.7	$ 30.9
Reclassified from accumulated other comprehensive (loss)	(6.2)	(5.2)
Other comprehensive gains (losses)	12.5	25.7	$ 2.2
Ending balance	9,731.5	8,263.8
Gains (Losses) on Hedge Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.7	0.2
Other comprehensive income (loss) before reclassifications	(0.8)	5.8
Reclassified from accumulated other comprehensive (loss)	(2.8)	(5.3)
Other comprehensive gains (losses)	(3.6)	0.5
Ending balance	(2.9)	0.7	0.2
Unrealized  Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	20.4	(9.8)
Other comprehensive income (loss) before reclassifications	13.8	30.7
Reclassified from accumulated other comprehensive (loss)	(4.7)	(0.5)
Other comprehensive gains (losses)	9.1	30.2
Ending balance	29.5	20.4	(9.8)
Foreign Currency Translation Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.0	(0.3)
Other comprehensive income (loss) before reclassifications	4.7	0.3
Reclassified from accumulated other comprehensive (loss)	0.0	0.0
Other comprehensive gains (losses)	4.7	0.3
Ending balance	4.7	0.0	(0.3)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8.7)	(3.4)
Other comprehensive income (loss) before reclassifications	1.0	(5.9)
Reclassified from accumulated other comprehensive (loss)	1.3	0.6
Other comprehensive gains (losses)	2.3	(5.3)
Ending balance	(6.4)	(8.7)	(3.4)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	12.4	(13.3)
Ending balance	$ 24.9	$ 12.4	$ (13.3)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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