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Capital Stock (Dividends Declared) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Debt Instrument [Line Items]          
Dividends declared per common share (in usd per share) $ 0.09 $ 0.09 $ 0 $ 0.18 $ 0.09
Total amount $ 19.3 $ 19.2   $ 38.5 $ 19.1
5.875% Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Coupon rate     5.875%    
6.375% Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Coupon rate     6.375%