Goodwill and Other Intangible Assets, net - Other Intangibles and Amortization (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other intangible assets
Accumulated Amortization	$ (362.0)	$ (336.0)
Other intangible assets, net
Other intangible assets, Acquired Cost	1,406.8	1,401.0
Other intangible assets, net	1,044.8	1,065.0
Trade names
Assets not subject to amortization:
Trade names	244.9	244.1
Customer relationships
Other intangible assets
Acquired Cost	847.7	844.8
Accumulated Amortization	(245.6)	(230.8)
Net Book Value	602.1	614.0
Intellectual property
Other intangible assets
Acquired Cost	236.0	272.0
Accumulated Amortization	(101.7)	(95.6)
Net Book Value	134.3	176.4
Other
Other intangible assets
Acquired Cost	78.2	40.1
Accumulated Amortization	(14.7)	(9.6)
Net Book Value	$ 63.5	$ 30.5