Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Net operating loss carryforwards, deferred tax assets	$ 67.7			$ 70.5	$ 67.7
U.S. corporate tax rate, percent				21.00%	21.00%	35.00%
Tax cuts and jobs act, income tax expense (benefit)	3.7	$ (17.9)	$ 1.5		$ (16.4)	$ (120.1)
Unrecognized tax benefits, accrued interest and penalties	0.8			$ 1.3	0.8
Unrecognized tax benefits, interest and penalties, income tax expense				0.5	0.7
Unrecognized tax benefits				13.5
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards, deferred tax assets	11.9			11.5	11.9
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards, deferred tax assets	50.8			57.4	50.8
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards, deferred tax assets	$ 0.2			$ 0.1	$ 0.2