Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	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	$ 1,270.4	$ 1,139.0
Goodwill, Additions	83.7	165.4
Goodwill, Foreign currency translation	(31.3)	(34.0)
Goodwill, Ending Balance	1,322.8	1,270.4
Other indefinite-lived intangible assets, Beginning Balance	386.6	295.6
Other indefinite-lived intangible assets, Additions	31.9	101.0
Other indefinite-lived intangible assets, Foreign currency translation	(10.5)	(10.0)
Other indefinite-lived intangible assets, Ending Balance	$ 408.0	$ 386.6