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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]        
Net benefit related to equity affiliate from India Finance Act $ 13.5   $ 13.5  
Proportionate share of accumulated dividend distribution taxes released per the India Finance Act 33.8   33.8  
Income tax provision related to estimated withholding taxes on future dividends $ 20.3   $ 20.3  
Discrete net tax expense related to Tax Act       $ 40.6
Reversal of non-recurring benefit related to U.S. taxation of deemed foreign dividends       56.2
Tax benefit related to finalization of assessment of impacts of Tax Act       $ 15.6
Effective tax rate (percent) 22.70% 19.90% 21.30% 23.30%
Income tax payments, net of refunds     $ 253.5 $ 165.6