Income Taxes - Unrecognized Tax Benefits and Other Disclosures (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]
Beginning balance	$ 12.5	$ 11.5	$ 12.6
Gross increases for tax positions of prior years	0.0	0.6	0.0
Gross decreases for tax positions of prior years	0.0	0.0	0.0
Gross increases for tax positions of current year	16.8	0.0	0.0
Settlements	0.0	0.0	0.0
Lapse of statute of limitations	(3.5)	0.0	(0.5)
Changes due to currency fluctuations	2.0	0.4
Changes due to currency fluctuations			(0.6)
Ending balance	$ 27.8	$ 12.5	$ 11.5

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.

+ 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 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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