Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Intangible Assets other than Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Intangible asset balances by major asset class
Gross Carrying Amount	$ 740.5	$ 729.9
Accumulated Amortization Amount	(279.1)	(245.5)
Net Book Value	283.9
Net Book Value	461.4	484.4
Customer relationships
Intangible asset balances by major asset class
Gross Carrying Amount	415.3	415.2
Accumulated Amortization Amount	(192.3)	(171.4)
Net Book Value	223.0	243.8
Patents
Intangible asset balances by major asset class
Gross Carrying Amount	2.8	1.6
Accumulated Amortization Amount	(1.7)	(1.6)
Net Book Value	1.1	0.0
Other intangibles
Intangible asset balances by major asset class
Gross Carrying Amount	144.9	140.7
Accumulated Amortization Amount	(85.1)	(72.5)
Net Book Value	59.8	68.2
Trademarks and tradenames
Intangible asset balances by major asset class
Net book value, indefinite intangibles	$ 177.5	$ 172.4