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Receivables (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Receivables [Abstract]    
Trade receivables $ 93.2 $ 55.9
Interest receivables 1.5 1.2
Other receivables 6.0 9.1
Allowance for doubtful accounts (1.1) (1.1)
Total $ 99.6 $ 65.1