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Income Taxes - Activity for Unrecognized Gross Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized Gross Tax Benefits
Balance at beginning of year	$ 130.0	$ 112.2	$ 114.8
Acquired balances	0.0	15.5	0.0
Additions for tax benefits related to the current year	11.9	9.4	7.4
Additions for tax benefits of prior years	12.3	8.0	2.8
Reductions for tax benefits of prior years	(1.4)	(0.2)	(1.9)
Lapse of statute	(1.3)	(8.2)	(10.9)
Settlements	(0.5)	(6.7)	0.0
Balance at end of year	$ 151.0	$ 130.0	$ 112.2

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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
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-URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318

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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 settlements with taxing authorities.

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

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