Income Taxes - Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency
Deferred tax asset, operating loss carryforward	$ 104.5
Deferred tax asset operating loss carryforward subject to expiration	61.9
Capital loss carryover	140.3
Deferred tax asset valuation allowances	68.2	$ 65.2
Tax benefit from changes in enacted taxes		1.8	$ 22.5
Income taxes paid	16.8	13.2	$ 15.4
Unrecognized tax benefit that would impact tax rate if recognized	1.7	0.1
Income tax penalties and interest accrued	0.4	$ 0.1
Possible decrease in unrecognized tax benefit in the next 12 months	0.4
State and Local Jurisdiction
Income Tax Contingency
Deferred tax asset valuation allowances	30.0
Foreign Tax Authority
Income Tax Contingency
Deferred tax asset valuation allowances	$ 27.1