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Receivables, Net (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Receivables, Net    
Trade accounts receivable $ 420.1 $ 361.1
Notes receivable 4.6 7.3
Other 53.2 40.8
Receivables, gross 477.9 409.2
Allowance for doubtful accounts (13.4) (13.1)
Receivables, net $ 464.5 $ 396.1