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Income Taxes - Uncertain Income Tax Positions (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]
Balance at beginning of year	$ 76.2	$ 68.2	$ 79.1
Increases related to positions taken in the current year	2.4	1.1	4.1
Increases and decreases related to positions taken in prior years		25.7	3.4
Increases and decreases related to positions taken in prior years	(26.4)
Decreases related to lapse of statutes of limitations	(10.3)	(18.8)	(13.0)
Settlements during the current year	0.0	0.0	(2.8)
Decreases for tax positions on dispositions	0.0	0.0	(2.6)
Balance at end of year	41.9	76.2	68.2
Offsetting non-current deferred tax asset	$ 14.4	$ 27.4	$ 34.0

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- Definition

Deferred Tax Asset on Uncertain Tax Positions (UTPs)

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- Definition

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

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318

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Amount of decrease in unrecognized tax benefits resulting from acquisitions.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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