Goodwill and Intangible Assets (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense	$ 2.8	$ 1.5	$ 8.0	$ 4.7
Annual Future Amortization Expense
Anticipated future amortization expense for remainder of 2015	2.8		2.8
Anticipated future amortization expense for 2016	10.4		10.4
Anticipated future amortization expense for 2017	10.0		10.0
Anticipated future amortization expense for 2018	9.5		9.5
Anticipated future amortization expense for 2019	$ 9.0		$ 9.0