Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	14 years
Finite-Lived Intangible Assets, Gross	$ 295.0	$ 146.3
Finite-Lived Intangible Assets, Accumulated Amortization	(97.6)	(88.5)
Amortization expense	15.0	11.9	$ 17.3
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	25.8
Finite-Lived Intangible Assets, Amortization Expense, Year Two	25.4
Finite-Lived Intangible Assets, Amortization Expense, Year Three	23.4
Finite-Lived Intangible Assets, Amortization Expense, Year Four	17.3
Finite-Lived Intangible Assets, Amortization Expense, Year Five	17.1
Government grants	$ 0.4	1.1	$ 8.7
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Finite-Lived Intangible Assets, Gross	$ 246.3	119.3
Finite-Lived Intangible Assets, Accumulated Amortization	$ (88.2)	(81.6)
Unpatented Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Finite-Lived Intangible Assets, Gross	$ 26.8	8.2
Finite-Lived Intangible Assets, Accumulated Amortization	$ (4.5)	(3.1)
Use Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	50 years
Finite-Lived Intangible Assets, Gross	$ 13.4	12.7
Finite-Lived Intangible Assets, Accumulated Amortization	$ (1.2)	(0.9)
Use Rights [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	50 years
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	14 years
Finite-Lived Intangible Assets, Gross	$ 5.5	4.9
Finite-Lived Intangible Assets, Accumulated Amortization	$ (2.9)	(2.2)
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years
Finite-Lived Intangible Assets, Gross	$ 3.0	1.2
Finite-Lived Intangible Assets, Accumulated Amortization	(0.8)	(0.7)
Other Noncurrent Liabilities [Member]
Finite-Lived Intangible Assets [Line Items]
Government grants	8.7	8.2
Other Current Liabilities [Member]
Finite-Lived Intangible Assets [Line Items]
Government grants	$ 0.5	$ 0.4