Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Effective Income Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate Reconciliation, Percent	0.20%	34.00%	14.60%	47.30%
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ (0.2)	$ (0.2)	$ (0.5)	$ (0.6)
Income tax settlement amount with taxing authority	7.4		7.4
Income Tax Examination, Interest Accrued	$ 3.9		$ 3.9