Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 153.0	$ 147.2
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 152.6	$ 146.5