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Supplemental Balance Sheet Information (Components of Other Assets) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule Of Other Assets [Line Items]    
Deferred tax assets $ 922.0 $ 826.9
Capitalized software 244.0 235.4
Long-term receivables 159.2 174.9
Investments 33.4 44.5
Interest-rate swap agreements (Notes 12 and 13) 0 94.8
Other 35.8 31.4
Other assets $ 1,394.4 $ 1,407.9