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Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Receivables [Abstract]    
Trade receivables $ 113.1 $ 96.1
Interest receivables 0.2 0.2
Income tax receivable 3.4 1.4
Other receivables 8.9 11.7
Allowance for doubtful accounts (1.0) (1.0)
Accounts Receivable, Net, Current $ 124.6 $ 108.4