Income Taxes (ASC 740-10) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Percentage of likelihood for realization of benefit upon ultimate settlement			50.00%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	$ 0.3	$ 0.0
Changes in prior year tax positions	0.8	0.1
Tax positions taken during the current year		0.2
Balance at year end	1.1	0.3	$ 0.0
Permanent Differences
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	0.3	0.0
Changes in prior year tax positions	0.8	0.1
Tax positions taken during the current year		0.2
Balance at year end	1.1	0.3	0.0
Temporary Differences
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	0.0	0.0
Changes in prior year tax positions	0.0	0.0
Tax positions taken during the current year		0.0
Balance at year end	0.0	0.0	0.0
Interest and Penalties Net of Tax Benefit
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning	0.0	0.0
Changes in prior year tax positions	0.0	0.0
Tax positions taken during the current year		0.0
Balance at year end	$ 0.0	$ 0.0	$ 0.0