Goodwill and Other Intangible Assets (Goodwill and Intangible Assets Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Beginning balance	$ 168.9	$ 0.0
Acquisitions of businesses	19.0	168.9
Ending balance	187.9	168.9	$ 0.0
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	182.3	5.1
Finite-Lived and Indefinite-Lived Intangibles Acquired	34.0	188.9
Goodwill, Other Changes	0.0	0.0
Amortization, including foreign currency translation	(28.5)	(11.7)	(1.4)
Ending balance	$ 187.8	$ 182.3	$ 5.1