Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of beginning and ending liability:
Balance at the beginning of the year	$ 15.8	$ 14.1	$ 12.4
Additions for tax positions of current year	5.0
Additions for tax positions of prior years		3.5	3.5
Reduction due to settlement with taxing authorities	(1.2)
Reduction due to statute expirations	(0.4)	(1.9)	(1.9)
Foreign currency translation		0.1	0.1
Balance at the end of the year	19.2	15.8	14.1
Accrued interest included in liability for income tax contingencies	2.6	$ 2.1	$ 1.7
Anticipated decrease in income tax benefits in the next 12 months	$ 1.6