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Derivative Financial Instruments and Hedging - Narrative (Details) - 12 months ended Dec. 31, 2015 € in Millions, lb in Millions, $ in Millions	EUR (€) lb	USD ($) lb
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Maximum amount of time hedged for nickel requirements	2020	2020
Percentage of estimated annual nickel requirements	28.00%	28.00%
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months		$ (23.6)
Nickel [Member]
Derivative [Line Items]
Derivative notional amount (in pounds of nickel) | lb	26	26
Cash Flow Hedging [Member] | Natural gas contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Percentage of forecasted natural gas usage hedged for 2017	55.00%	55.00%
Percentage of forecasted natural gas usage hedged for 2018	15.00%	15.00%
Pre-tax loss on ineffective portion of hedge		$ 3.3
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative notional amount settled | €	€ 211.9
Proceeds from hedge		56.5
Pre-tax gain on ineffective portion of hedge		14.3
Fair Value Hedging [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Maturity Dates Through 2017 [Member]
Derivative [Line Items]
Derivative notional amount | €	139.2
Notional amount of derivatives entered during period | €	€ 244.7
Cost of Sales [Member] | Fair Value Hedging [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) on derivatives		$ 9.0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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