Intangible Assets - Accumulated Impairment, Changes in Goodwill and Other Indefinite-Lived Intangibles (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2012
Intangible Assets
Goodwill, Accumulated impairment loss			$ 606.3
Other indefinite-lived intangible assets, Accumulated impairment loss			$ 37.1
Summary of the changes in the carrying amount of goodwill and other indefinite-lived intangible assets
Goodwill, Beginning Balance	$ 1,323.2	$ 1,270.8
Goodwill, Additions	24.9	83.7
Goodwill, Disposals	(1.7)
Goodwill, Foreign currency translation	(55.1)	(31.3)
Goodwill, Ending Balance	1,291.3	1,323.2
Other indefinite-lived intangible assets, Beginning Balance	408.0	386.6
Other indefinite-lived intangible assets, Additions	26.2	31.9
Other indefinite-lived intangible assets, Disposals	(0.3)
Other indefinite-lived intangible assets, Foreign currency translation	(13.8)	(10.5)
Other indefinite-lived intangible assets, Ending Balance	$ 420.1	$ 408.0