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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Income Tax [Line Items]          
Unrecognized tax benefits $ 207.7   $ 207.7   $ 237.0
Net benefit related to equity affiliate from India Finance Act       $ 13.5  
Proportionate share of accumulated dividend distribution taxes released per the India Finance Act       33.8  
Income tax provision expense related to estimated withholding taxes on future dividends       $ 20.3  
Effective tax rate (percent) 16.30% 19.30% 18.60% 20.70%  
Income tax payments, net of refunds     $ 284.8 $ 329.6  
Cash provided by discontinued operations, tax settlement refund     6.7 $ 0.0  
Continuing operations          
Income Tax [Line Items]          
Tax benefit related to release of uncertain tax positions $ 21.5        
Unrecognized tax benefits that would impact effective tax rate if recognized 75.4   75.4    
Discontinued operations          
Income Tax [Line Items]          
Estimated unrecognized tax benefits reasonably possible to be recognized in a future period, net of tax 50.0   $ 50.0    
Discontinued operations | EfW          
Income Tax [Line Items]          
Tax benefit related to release of uncertain tax positions $ 8.2