Goodwill and Other Intangible Assets, net - Other Intangibles and Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Other intangible assets
Accumulated Amortization	$ (407.3)	$ (336.0)
Other intangible assets, net
Other intangible assets, Acquired Cost	1,400.8	1,401.0
Other intangible assets, net	993.5	1,065.0
Trade names
Assets not subject to amortization:
Trade names	244.3	244.1
Customer relationships
Other intangible assets
Acquired Cost	845.1	844.8
Accumulated Amortization	(273.1)	(230.8)
Net Book Value	572.0	614.0
Intellectual property
Other intangible assets
Acquired Cost	269.8	272.0
Accumulated Amortization	(120.7)	(95.6)
Net Book Value	149.1	176.4
Other
Other intangible assets
Acquired Cost	41.6	40.1
Accumulated Amortization	(13.5)	(9.6)
Net Book Value	$ 28.1	$ 30.5