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Income Taxes - Reconciliation of Liability for Uncertain Tax Positions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the year	$ 109.1	$ 119.3	$ 60.3
Additions for tax positions related to the current year	15.6	17.5	21.8
Additions for tax positions of prior years	6.2	2.8	53.5
Reductions for tax positions of prior years	(0.3)	(1.3)	(3.9)
Reductions related to settlements with taxing authorities	(0.5)	(0.9)	0.0
Reductions due to statute expirations	(29.4)	(28.3)	(12.4)
Balance at the end of the year	$ 100.7	$ 109.1	$ 119.3

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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.

+ References

No definition available.

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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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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