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Supplemental Balance Sheet Information (Components of Other Assets) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule Of Other Assets [Line Items]    
Deferred tax assets $ 900.1 $ 826.9
Capitalized software 242.5 235.4
Long-term receivables 173.4 174.9
Investments 46.4 44.5
Interest-rate swap agreements (Notes 12 and 13) 0 94.8
Other 51.0 31.4
Other assets $ 1,413.4 $ 1,407.9