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Receivables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 28.9 $ 53.5 $ 50.1
Provisions 3.1 2.6 8.0
Write-offs (4.7) (26.3) (4.0)
Translation and other 0.3 (0.9) (0.6)
Balance at end of year $ 27.6 $ 28.9 $ 53.5