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Supplemental Balance Sheet Information (Components of Other Assets) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule Of Other Assets [Line Items]    
Deferred tax assets $ 853.3 $ 827.2
Capitalized software 242.0 235.4
Long-term receivables 177.3 174.9
Investments 45.2 44.5
Interest-rate swap agreements (Notes 11 and 12) 0 94.8
Other 45.2 31.4
Other assets $ 1,363.0 $ 1,408.2