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Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Trade receivables $ 139.0 $ 87.0
Income tax receivable 24.0 16.0
Other receivables 16.0 25.0
Allowance for doubtful accounts (2.0) (1.0)
Total $ 177.0 $ 128.0