Income Taxes - Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 75.7	$ 129.9	$ 114.2
Additions based on tax positions related to the current period	4.2	1.5	5.3
Additions for tax positions of prior periods	509.9	51.7	17.2
Reductions for tax positions of prior periods	(18.8)	(63.6)	(10.3)
Statute expirations	(3.2)	(7.9)	(0.1)
Settlement payment	(4.4)		(35.9)
Settlement refund			3.6
Ending balance	$ 563.4	$ 75.7	$ 129.9

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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