Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, amortization expense	$ 7.1	$ 3.9	$ 2.3
Intangible assets, amortization expense 2016	10.2
Intangible assets, amortization expense 2017	9.0
Intangible assets, amortization expense 2018	8.8
Intangible assets, amortization expense 2019	8.6
Intangible assets, amortization expense 2020	$ 8.2