Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term borrowings	$ 25.0	$ 146.7
Senior Notes	956.0	948.5
Fair Value, Inputs, Level 2 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	121.6	298.0
Short-term borrowings	25.0	146.7
Fair value adjustment asset (liability) related to hedged fixed rate debt instrument	6.4	(0.9)
Fair Value, Inputs, Level 2 \| Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value adjustment asset (liability) related to hedged fixed rate debt instrument	6.4	(0.9)
Cash equivalents	121.6	298.0
Short-term borrowings	25.0	146.7
2.875% Senior notes due October 1, 2022 \| Fair Value, Inputs, Level 2 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	399.7	399.7
2.875% Senior notes due October 1, 2022 \| Fair Value, Inputs, Level 2 \| Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	393.9	393.3
3.35% Senior notes due December 15, 2015 \| Fair Value, Inputs, Level 2 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	250.0	249.9
3.35% Senior notes due December 15, 2015 \| Fair Value, Inputs, Level 2 \| Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	249.7	255.6
2.45% Senior notes due December 15, 2019 \| Fair Value, Inputs, Level 2 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	299.9	299.8
2.45% Senior notes due December 15, 2019 \| Fair Value, Inputs, Level 2 \| Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	$ 302.0	$ 298.6

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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

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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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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents the amount of short-term debt existing as of the balance sheet date.

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