Goodwill and Intangible Assets (Schedule of Estimated Amortization Expense of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Amortization expense
2015 (six months remaining)	$ 0.9		$ 0.9
2016	3.5		3.5
2017	3.5		3.5
2018	3.5		3.5
2019	3.5		3.5
Thereafter	32.1		32.1
Carrying Value	47.0		47.0
Amortization expense	$ 0.9	$ 3.1	$ 2.8	$ 10.4