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Receivables (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Receivables [Abstract]    
Trade receivables $ 83.5 $ 56.2
Interest receivables 1.1 1.1
Other receivables 9.8 10.8
Allowance for doubtful accounts (1.4) (1.3)
Total $ 93.0 $ 66.8