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Schedule II VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for doubtful accounts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 98.2 $ 98.1 $ 111.4
Provisions charged to earnings 18.1 20.4 16.3
Write-offs (17.6) (16.9) (20.3)
Translation adjustments 12.4 (3.2) (10.1)
Reclassifications and other, deductions (0.3) (0.2)  
Reclassifications and other, additions     0.8
Balance at end of year $ 110.8 $ 98.2 $ 98.1