Goodwill and Intangible Assets, net - Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 1,028.3	$ 1,037.4
Accumulated Amortization	(316.8)	(271.2)
Tradenames and other	53.5	53.3
Total intangible assets	1,081.8	1,090.7
Patents, tradenames and trademarks
Other Intangible Assets [Line Items]
Finite-lived intangible assets, gross	201.2	204.4
Accumulated Amortization	(62.6)	(58.6)
Customer/agent relationships and other
Other Intangible Assets [Line Items]
Finite-lived intangible assets, gross	827.1	833.0
Accumulated Amortization	$ (254.2)	$ (212.6)