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Derivative Financial Instruments - Schedule of amount of derivative instrument gains and (losses) before taxes (Details) (Cash Flow Hedges [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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 | $ 1.5 | $ (1.1) | $ (9.7)
Interest rate swaps [Member] |  |  |
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 | 1.5 | (1.1) | (5.4)
Treasury rate locks [Member] |  |  |
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 | $ 0 | $ 0 | $ (4.3)

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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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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