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Other Financial Statement Disclosures - Components of Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Other Financial Statement Disclosures [Abstract]    
Trade $ 426.9 $ 395.7
Income tax 6.6 4.5
Other 7.0 10.3
Total receivables - trade and other $ 440.5 $ 410.5