Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Contingency [Line Items]
Provision for income taxes	$ 7.0	$ 4.6	$ 8.0	$ 3.0
Effective tax rate	40.00%	115.00%	(39.80%)	66.70%
Effect of tax rates in foreign jurisdictions	$ 1.0		$ 1.0
Nondeductible expense, executive compensation and other	0.7		0.8
Valuation allowance expense (benefit)	1.2	$ 0.4	1.2	$ 1.0
Net expenses due to 2017 Tax Act		3.2
Tax expense on unrecognized tax benefits		$ 0.4		$ 0.7
FRANCE
Income Tax Contingency [Line Items]
Valuation allowance expense (benefit)	1.2		1.4
Valuation allowance, DTA increase			0.2
UNITED KINGDOM
Income Tax Contingency [Line Items]
Effect of tax rates in foreign jurisdictions	$ 2.9		$ 2.9