Income Taxes - Reconciliation of Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount
Tax provision at U.S. statutory rate	$ 20.4	$ 20.3	$ 24.5
Foreign income tax rate differential	2.7	0.6	2.5
Income from passthrough entities	2.3	1.7	0.7
Global intangible low tax inclusion	4.8	(0.1)	7.0
Foreign derived intangible income	(0.3)	(0.2)	(4.2)
State income tax, net of federal benefit	1.8	(0.2)	1.7
Adjustments to valuation allowances	(3.9)	(3.7)	(2.5)
Transition tax	0.0	(0.7)	(11.6)
Other tax credits	(0.8)	(2.0)	(2.6)
Foreign tax credits	(9.9)	(3.5)	(5.1)
Other foreign operational taxes	3.5	2.9	3.1
Remeasurement of deferred taxes due to tax law	0.4	0.9	(1.8)
Non-deductible compensation	0.4	1.1	0.4
Other, net	(3.0)	(1.9)	(1.4)
Provision for income taxes	$ 18.4	$ 15.2	$ 10.7
Percent
Tax provision at U.S. statutory rate	21.00%	21.00%	21.00%
Foreign income tax rate differential	2.70%	0.50%	2.20%
Income from passthrough entities	2.30%	1.60%	0.60%
Global intangible low tax inclusion	4.80%	(0.10%)	6.00%
Foreign derived intangible income	(0.30%)	(0.20%)	(3.60%)
State income tax, net of federal benefit	1.80%	(0.20%)	1.50%
Adjustments to valuation allowances	(3.90%)	(3.80%)	(2.10%)
Transition tax	0	(0.006)	(0.100)
Other tax credits	(0.80%)	(2.10%)	(2.30%)
Foreign tax credits	(10.00%)	(3.60%)	(4.40%)
Other foreign operational taxes	3.50%	3.00%	2.70%
Remeasurement of deferred taxes due to tax law	0.40%	1.00%	(1.50%)
Non-deductible compensation	0.40%	1.10%	0.30%
Other, net	(3.00%)	(1.90%)	(1.20%)
Provision for income taxes	18.90%	15.70%	9.20%