Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

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Shareholders' Equity - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Class of Stock [Line Items]      
Cash dividends paid on common stock   $ 32.3 $ 31.7
Treasury Stock      
Class of Stock [Line Items]      
Common stock, shares issued 0.1 0.4 (0.1)