Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Defined Benefit Retirement Plans
Amounts recognized on the balance sheet:
Amounts unrelated to service costs, benefit	$ 0.3	$ 0.5	$ 0.6	$ 1.6
Defined Benefit Retirement Plans | U.S.
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans			0.5	$ 0.5
Expected employer contribution in full current year	$ 0.7		$ 0.7
Defined Benefit Plan, Tax Status [Extensible List]	Non qualified	Non qualified	Non qualified	Non qualified	Non qualified
Net amortization gain deferral	$ (0.3)		$ (0.5)	$ (0.2)
Defined Benefit Retirement Plans | European
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans			2.2	1.9
Expected employer contribution in full current year	5.6		5.6
Net amortization gain deferral	(0.3)	$ (0.1)	(0.8)	(0.3)
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Net amortization gain deferral	0.2	$ 0.3	0.6	$ 0.7
Postretirement Health Care and Life Insurance Benefit Plans | Maximum
Amounts recognized on the balance sheet:
Expected employer contribution in full current year	$ 0.4		$ 0.4