Financial Instruments - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Asset Category
Total	$ 32.7	$ 13.2
Liability Category
Total	90.9	90.1
Other current assets \| Level 2 \| Foreign exchange and metals contracts not designated as hedging instruments \| Not Designated as Hedging Instrument
Asset Category
Foreign exchange and metals contracts not designated as hedging instruments	15.9	5.5
Other current assets \| Level 2 \| Interest rate swaps designated as cash flow hedging instruments \| Designated as Hedging Instrument
Asset Category
Foreign exchange and metals contracts not designated as hedging instruments	4.8	0.0
Other assets \| Level 2
Asset Category
Available for sale equity securities	0.1	0.6
Other assets \| Level 2 \| Interest rate swaps designated as cash flow hedging instruments \| Designated as Hedging Instrument
Asset Category
Foreign exchange and metals contracts not designated as hedging instruments	8.9	3.4
Other assets \| Level 1
Asset Category
Available for sale equity securities	3.0	3.7
Accrued expenses and other liabilities \| Level 2 \| Foreign exchange and metals contracts not designated as hedging instruments \| Not Designated as Hedging Instrument
Liability Category
Derivatives	9.0	7.3
Accrued expenses and other liabilities \| Level 2 \| Interest rate swaps designated as cash flow hedging instruments \| Designated as Hedging Instrument
Liability Category
Derivatives	0.6	2.8
Other liabilities \| Level 2 \| Interest rate swaps designated as cash flow hedging instruments \| Designated as Hedging Instrument
Liability Category
Derivatives	0.6	0.8
Contingent consideration \| Level 3
Liability Category
Long-term contingent consideration	$ 80.7	$ 79.2

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value of financial and nonfinancial obligations.

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