Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended
Mar. 31, 2011	Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Fair value of long-term debt		$ 816.1	$ 816.1	$ 847.2
Carrying value of long-term debt		815.4	815.4	810.8
Equity component included in carrying value of long-term debt		18.0	18.0
Number of interest rate swap agreements	4
Interest rate swaps maturity date	Oct. 01, 2016
Notional amount of interest rate swaps		215.0	215.0
Interest rate swap, variable interest rate		5.43%	5.43%
Fair value of interest rate swap assets		7.5	7.5
Decrease in interest expense due to converting the interest rate from fixed to variable		$ 1.2	$ 2.6
7 3/4 % Senior Notes Due 2016 [Member]
Senior notes, interest percentage		7.75%	7.75%
Senior notes maturity year		2016	2016
Interest rate swap, fixed interest rate		7.75%	7.75%
6 3/4 % Senior Notes Due 2020 [Member]
Senior notes, interest percentage		6.75%	6.75%
Senior notes maturity year		2020	2020

Decrease in interest expense due to converting the interest rate from fixed to variable.

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Senior notes maturity year.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ 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 210.5-02.22)

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-Paragraph 31

-Subparagraph b

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

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-Number APB14-1

-Paragraph 31

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Interest rate stated in the contractual debt agreement.

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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 22

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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

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Fixed interest rate related to the interest rate derivative.

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- Definition

The date the derivative matures.

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Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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- Definition

Fair value of all derivative assets designated as fair value hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

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-Name Accounting Standards Codification

-Topic 815

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-Glossary Notional Amount

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Number of interest rate derivative instruments held by the entity at the reporting date.

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