Income Taxes - Schedule Of Gross Unrecognized Income Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 78.8	$ 65.4	$ 106.0
Increases related to tax positions taken during the current year	26.5	22.5	21.1
Increases related to tax positions taken during a prior year	1.2	0.0	0.0
Decreases related to tax positions taken during a prior year	0.0	(0.9)	(46.5)
Decreases related to settlements with tax authorities	(3.8)	0.0	(0.5)
Decreases related to expiration of statute of limitations	(6.0)	(8.2)	(14.7)
Ending balance	$ 96.7	$ 78.8	$ 65.4

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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- Definition

Amount of unrecognized tax benefits.

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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 increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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