Goodwill and Intangible Assets - Narrative (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 [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss	$ 8.3		$ 8.3
Aggregate amortization expense	$ 3.7	$ 3.8	$ 11.1	$ 11.2