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Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Sep. 04, 2018
Aug. 09, 2018
Jun. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]          
Dividends paid per common share (in USD per share)     $ 0.3635    
Dividends declared per common share (in USD per share)       $ 0.3635 $ 0.3615
Dividends, common stock     $ 85.5    
Subsequent Event          
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]          
Dividends declared per common share (in USD per share)   $ 0.3640      
Scenario, Forecast          
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]          
Dividends, common stock $ 85.8