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Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Aug. 06, 2019
Jun. 04, 2019
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Subsequent Event [Line Items]          
Quarterly cash dividend paid (in USD per share)   $ 0.3655      
Quarterly cash dividend (in USD)   $ 87.1      
Quarterly cash dividend declared (in dollars per share)       $ 0.3655 $ 0.3635
Scenario, Forecast          
Subsequent Event [Line Items]          
Quarterly cash dividend (in USD)     $ 87.3    
Subsequent Event          
Subsequent Event [Line Items]          
Quarterly cash dividend declared (in dollars per share) $ 0.3660