Intangible Assets - Summary of Changes (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Summary of the changes in the carrying amount of goodwill and other indefinite-lived intangible assets
Goodwill, Beginning balance	$ 1,660.5
Goodwill, Additions	65.0
Goodwill, Disposals	(6.7)
Goodwill, Foreign currency translation	(18.1)
Goodwill, Ending balance	1,700.7
Other indefinite-lived intangible assets, Beginning Balance	474.0
Other indefinite-lived intangible assets, Additions	8.9
Other indefinite-lived intangible assets, Disposals	(3.3)
Other indefinite-lived intangible assets, Foreign currency translation	(5.5)
Other indefinite-lived intangible assets, Ending Balance	$ 474.1