Intangible Assets Intangible Assets Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible Assets Abstract
Amortization of intangible assets	$ 171.3	$ 139.3	$ 132.0
Future estimated amortization expense, 2015	177.0
Future estimated amortization expense, 2016	174.0
Future estimated amortization expense, 2017	174.0
Future estimated amortization expense, 2018	173.0
Future estimated amortization expense, 2019	$ 169.0