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Equity Reclassification out of Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Interest expense	$ 23.7	$ 27.2
Tax expense	54.3	52.2
Unrealized Loss on Cash Flow Hedges [Member] \| Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Interest expense	0.2
Tax expense	$ 0.1

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

The cost of borrowed funds accounted for as interest that was charged against earnings during the period.