Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Credit-risk-related contingent features		we have no credit-risk-related contingent features in our agreements with the financial institutions that would require us to post collateral for derivative positions in a liability position.
Impairment expense	$ 60.2	$ 64.4
Senior Notes 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes, interest rate, as a percent	2.00%	2.00%	2.00%
Senior Notes 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes, interest rate, as a percent	3.45%	3.45%	3.45%
Senior Notes Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes, fair value	$ 771.7	$ 771.7	$ 779.5
Senior notes, face value	800.0	800.0	$ 800.0
Surface Technologies
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Assets, Fair Value Disclosure, Nonrecurring	39.2	$ 39.2
Impairment expense	$ 56.6

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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Contractual interest rate for funds borrowed, under the debt agreement.

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Description of the existence and nature of credit-risk-related contingent features related to derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) that are in a net liability position at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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