Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Abstract]
Goodwill, Acquired During Period	$ 193.3	$ 135.7
Goodwill, Impairment Loss	0.0
Goodwill [Roll Forward]
Net Book Value, Beginning Balance	6,129.2	6,175.7
Foreign exchange and other	268.2	(182.2)
Net Book Value, Ending Balance	$ 6,590.7	$ 6,129.2