Valuation Allowances on Deferred Tax Assets Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure - Valuation Allowance [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 157.1		$ 157.1
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 5.9	$ 11.8	$ 19.1	$ 31.6