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Other Financial Statement Disclosures - Components of Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Other Financial Statement Disclosures [Abstract]    
Trade $ 228.6 $ 286.2
Income tax 8.3 7.7
Other 7.2 7.4
Total receivables - trade and other $ 244.1 $ 301.3