Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.7-03.16)

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-Subparagraph (SX 210.9-03.13,16)

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

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- Definition

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

+ 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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-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Subparagraph (SX 210.5-02.19(b),22(b))

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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-Publisher SEC

-Name Regulation S-X (SX)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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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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No definition available.

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Borrowings (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Borrowings
Total long-term debt	$ 749.9us-gaap_DebtAndCapitalLeaseObligations	$ 749.8us-gaap_DebtAndCapitalLeaseObligations
Total long-term debt, net of current portion	749.9	749.8
3.75% senior notes due 2022
Borrowings
Total long-term debt	349.1	349.1
Interest rate (as a percent)	3.75%
Unamortized discount	(0.9)	(0.9)
Par value of senior notes	350
3.75% senior notes due 2022 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	346.9
5.125% senior notes due 2020
Borrowings
Total long-term debt	249.4	249.3
Interest rate (as a percent)	5.125%
Unamortized discount	(0.6)	(0.7)
Par value of senior notes	250
5.125% senior notes due 2020 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	275.0
6.125% senior notes due 2016
Borrowings
Total long-term debt	149.8	149.8
Interest rate (as a percent)	6.125%
Unamortized discount	(0.2)	(0.2)
Par value of senior notes	150
6.125% senior notes due 2016 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	159.2
Revolving credit facility
Borrowings
Remaining borrowing capacity	600.0
Amount outstanding	0		0
Industrial development and revenue bonds through 2018
Borrowings
Total long-term debt	1.5	1.5
Other, including capital lease obligations
Borrowings
Total long-term debt	0.1	0.1
Uncommitted line of credit
Borrowings
Maximum borrowing capacity	45.0	45.0
Amount outstanding	$ 0		$ 0