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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Income Tax Disclosure [Abstract]            
Income tax expense $ 153.1 $ 162.5   $ 350.5 $ 458.9  
Effective tax rate (percent) 24.40% 26.40%   23.90% 31.60%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00%     24.50%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent       21.00%    
Deferred tax assets net of DTL $ 190.5     $ 190.5   $ 211.7
Valuation allowance for deferred income taxes $ 16.6     $ 16.6   $ 17.7