Income Taxes - Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency
Deferred tax asset, operating loss carryforward	$ 128.4
Deferred tax asset operating loss carryforward subject to expiration	47.3
Deferred tax asset valuation allowances	33.9	$ 68.2
Tax benefit from changes in enacted taxes			$ 1.8	$ 22.5
Income taxes paid	12.5	16.8	$ 13.2
Unrecognized tax benefit that would impact tax rate if recognized	1.3	1.7
Income tax penalties and interest accrued	0.3	$ 0.4
Possible decrease in unrecognized tax benefit in the next 12 months	0.4
Foreign Tax Authority
Income Tax Contingency
Deferred tax asset valuation allowances	$ 23.8