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Income Tax (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Effective income tax rate (benefit) 5.20% (2.60%)    
Interest on income taxes accrued     $ 12.9 $ 36.4
Interest on income taxes accrued, acquisitions     15.8 23.2
Income tax penalties accrued     67.9 $ 72.8
Tax Cuts And Jobs Act Of 2017, transition tax for accumulated foreign earnings     $ 471.6  
Tax Cuts And Jobs Act Of 2017, provisional income tax expense (benefit), effect of change on earnings per share, diluted     $ (1.89)