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
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]    
Cash dividends paid on common stock $ 15.8 $ 13.1
Treasury Stock, Value, Acquired, Cost Method $ 371.3  
Treasury Stock    
Class of Stock [Line Items]    
Treasury Stock, Shares, Acquired 0.0  
Treasury Stock, Value, Acquired, Cost Method $ 0.0  
Common stock, shares issued 0.1 0.2