Financial Instruments - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Asset Category
Total	$ 93.6	$ 62.4
Liability Category
Total	96.1	96.7
Cash and cash equivalents \| Level 2
Asset Category
Cash equivalents	79.7	48.2
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	7.4	8.5
Other assets \| Level 2
Asset Category
Available for sale equity securities	0.6	0.6
Other assets \| Level 1
Asset Category
Available for sale equity securities	5.9	5.1
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	8.7	10.7
Accrued expenses and other liabilities \| Level 2 \| Interest rate swaps designated as cash flow hedging instruments \| Designated as Hedging Instrument
Liability Category
Derivatives	6.3	10.2
Other liabilities \| Level 2 \| Interest rate swaps designated as cash flow hedging instruments \| Designated as Hedging Instrument
Liability Category
Derivatives	2.1	0.0
Contingent consideration \| Level 3
Liability Category
Long-term contingent consideration	$ 79.0	$ 75.8

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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-Name Accounting Standards Codification
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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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