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Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Nov. 05, 2019
Sep. 04, 2019
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Subsequent Event [Line Items]              
Quarterly cash dividend paid (in USD per share)   $ 0.3660          
Quarterly cash dividend   $ 87.3          
Dividends declared per common share (in dollars per share)       $ 0.3660 $ 0.3640 $ 0.7315 $ 0.7275
Scenario, Forecast              
Subsequent Event [Line Items]              
Quarterly cash dividend     $ 87.7        
Subsequent Event              
Subsequent Event [Line Items]              
Dividends declared per common share (in dollars per share) $ 0.3665