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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Cash Flow [Line Items]      
Interest $ 22.7 $ 22.3 $ 13.7
Income taxes 89.3 79.8 65.5
Captial lease arrangments 18.1 43.0 33.9
Proceeds from Sale-leaseback Transations 0 17.6 1.2
Value of Shares of Common Stock for Defined Benefit Plan Contribution $ 9.0