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Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Trade receivables $ 132.3 $ 124.6
Income tax receivable 1.9 2.2
Other receivables 16.0 16.6
Allowance for doubtful accounts (0.9) (0.9)
Total $ 149.3 $ 142.5