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Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Mar. 05, 2019
Feb. 05, 2019
Dec. 05, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Dividends paid per common share (in usd per share)     $ 0.3645        
Dividends declared per common share (in usd per share)       $ 0.3645 $ 0.3625 $ 1.092 $ 1.086
Dividends, common stock     $ 86.3        
Subsequent event              
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Dividends declared per common share (in usd per share)   $ 0.3650          
Scenario forecast              
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Dividends, common stock $ 86.8