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Derivative Financial Instruments (Details 2) (Cash Flow Hedges, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of the location and amount of derivative instrument gains and losses (before taxes) reported in the Consolidated Statements of Income
Amount of Gain (Loss) Recognized in Other Comprehensive Income	$ (1.1)	$ (9.7)	$ 5.9
Interest rate swaps
Summary of the location and amount of derivative instrument gains and losses (before taxes) reported in the Consolidated Statements of Income
Amount of Gain (Loss) Recognized in Other Comprehensive Income	(1.1)	(5.4)	2.5
Treasury rate locks
Summary of the location and amount of derivative instrument gains and losses (before taxes) reported in the Consolidated Statements of Income
Amount of Gain (Loss) Recognized in Other Comprehensive Income		$ (4.3)	$ 3.4

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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