Intangible Assets Intangible Assets Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangible Assets Abstract
Amortization of intangible assets	$ 11.9	$ 9.5	$ 9.5
Future estimated amortization expense, year one	19.0
Future estimated amortization expense, year two	18.9
Future estimated amortization expense, Year Three	18.9
Future estimated amortization expense, year four	18.9
Future estimated amortization expense, year five	$ 18.9