Derivative Instruments and Hedging Activities Asset and Liability Derivative Instruments Designated as Hedges in the Balance Sheets (Details) (Fair Value Hedging [Member], Interest Rate Derivative Instruments [Member], Level 2 [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Consolidated total, derivative assets	$ 0	$ 8.9
Prepaid Expenses and Other [Member]
Derivatives, Fair Value [Line Items]
Interest rate derivative instrument, Current	0	1.1
Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Interest rate derivative instrument, Noncurrent	$ 0	$ 7.8

Derivative Instruments and Hedging Activities Asset and Liability Derivative Instruments Designated as Hedges in the Balance Sheets (Details) (Fair Value Hedging [Member], Interest Rate Derivative Instruments [Member], Level 2 [Member], USD $)
In Millions, unless otherwise specified

Dec. 31, 2012

Dec. 31, 2011

Derivatives, Fair Value [Line Items]

Consolidated total, derivative assets

$ 0

$ 8.9

Prepaid Expenses and Other [Member]

Derivatives, Fair Value [Line Items]

Interest rate derivative instrument, Current

1.1

Other Noncurrent Assets [Member]

Derivatives, Fair Value [Line Items]

Interest rate derivative instrument, Noncurrent

$ 0

$ 7.8

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FIN39-1

-Paragraph 10A, 10B

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6509628

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

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-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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-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

+ Details

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments which are expected to exist longer than one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FIN39-1

-Paragraph 10A, 10B

-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.

Reference 2: 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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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

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-Topic 815

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+ Details