Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term borrowings	$ 146.7us-gaap_ShortTermBorrowings	$ 153.8us-gaap_ShortTermBorrowings
Senior Notes	698.6us-gaap_LongTermDebtNoncurrent	649.5us-gaap_LongTermDebtNoncurrent
Fair Value, Inputs, Level 2 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	298.0	318.5
Short-term borrowings	146.7	153.8
Fair value adjustment related to hedged fixed rate debt instrument	(0.9)	0
Fair Value, Inputs, Level 2 \| Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value adjustment related to hedged fixed rate debt instrument	(0.9)	0
Cash equivalents	298.0	318.5
Short-term borrowings	146.7	153.8
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	393.3	369.8
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	249.9	249.8
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	255.6	258.2
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	299.8	0
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	$ 298.6	$ 0

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

-URI http://asc.fasb.org/extlink&oid=6506951

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

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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

-Glossary Cash Equivalents

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Section S99

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-Subparagraph (SX 210.5-02.1)

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- Definition

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.

+ References

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-Publisher FASB

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-Paragraph 4A

-Subparagraph (b)

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- Definition

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.

+ References

No definition available.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Topic 210

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-Subparagraph (SX 210.5-02.22)

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- Definition

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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-Name Regulation S-X (SX)

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-Topic 210

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-Topic 942

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-Section S99

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-Topic 944

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 2, 3

-Article 9

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- Definition

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.

+ References

No definition available.

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