Goodwill and Intangible Assets (Schedule of Estimated Amortization Expense of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Amortization expense
2015 (six months remaining)	$ 1.8		$ 1.8
2016	3.5		3.5
2017	3.5		3.5
2018	3.5		3.5
2019	3.5		3.5
Thereafter	32.2		32.2
Carrying Value	48.0		48.0
Amortization expense	$ 1.0	$ 3.7	$ 1.9	$ 7.3