Financial Instruments - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Asset Category
Total	$ 15.8	$ 8.4
Liability Category
Total	85.2	84.2
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	0.3	2.0
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	7.3	0.0
Other assets \| Level 2
Asset Category
Available for sale equity securities	0.0	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	7.9	3.4
Other assets \| Level 1
Asset Category
Available for sale equity securities	0.3	2.4
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	2.5	1.4
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	0.4	0.8
Contingent consideration \| Level 3
Liability Category
Long-term contingent consideration	$ 81.7	$ 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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value of financial and nonfinancial obligations.

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