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Other Financial Statement Disclosures - Components of Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Other Financial Statement Disclosures [Abstract]    
Trade $ 184.3 $ 231.7
Income tax 15.8 12.0
Other 7.3 7.5
Total receivables - trade and other $ 207.4 $ 251.2