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Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Trade receivables $ 141.1 $ 96.1
Income tax receivable 2.2 1.7
Other receivables 11.5 11.5
Allowance for doubtful accounts (1.0) (1.0)
Total $ 153.8 $ 108.3