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Income Taxes - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Sep. 30, 2017
Mar. 31, 2018
Sep. 30, 2018
Income Tax Disclosure [Abstract]      
Effective income tax rate (benefit) (2.10%)    
Interest on income taxes accrued   $ 12.9 $ 38.9
Interest on income taxes accrued, acquisitions     23.2
Income tax penalties accrued   67.9 56.5
Penalties on income taxes accrued, acquisitions     $ 15.8
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)