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Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Sep. 05, 2017
Aug. 03, 2017
Jun. 06, 2017
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]          
Dividends, per share (in usd per share)     $ 0.3615    
Payments of ordinary dividends     $ 82.9    
Dividends declared per common share (in USD per share)       $ 0.3615 $ 0.3595
Subsequent Event          
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]          
Dividends declared per common share (in USD per share)   $ 0.362      
Scenario, Forecast          
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]          
Dividends, common stock $ 84.4