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Supplementary Financial Statement Information - Accrued Liabilities (Details7) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Supplementary Financial Statement Information [Abstract]    
Salaries, wages and benefits $ 101.3 $ 105.6
Interest 35.0 35.2
Other accrued liabilities 134.2 93.3
Accrued liabilities $ 270.5 $ 234.1