Income Taxes - Unrecognized Tax Benefits (Details) - 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]
Unrecognized tax benefits, beginning of year	$ 214.9	$ 133.4	$ 59.0
Additions based on tax positions related to the current year	10.4	17.8	40.8
Additions for tax positions of prior years	16.1	79.7	39.0
Reductions for tax positions of prior years	(26.5)	(13.0)	(3.8)
Lapse of statute of limitations	(6.1)	(2.3)	(3.5)
Settlements	(0.5)	(0.3)	(6.4)
Effect of foreign currency translation	1.7
Effect of foreign currency translation		(0.4)	(0.9)
Separation related adjustments	(9.9)	0.0	9.2
Unrecognized tax benefits, end of year	$ 200.1	$ 214.9	$ 133.4

Unrecognized Tax Benefits, Increase (Decrease) Due To Disposal Of Business

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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.

+ References

No definition available.

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Amount of unrecognized tax benefits.

+ References

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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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

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