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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Common shares, par value per share (in dollars per share) $ 1.00 $ 1.00
Common shares, authorized shares 50,000,000 50,000,000
Common shares, issued shares 3,101,761 3,185,353
Common shares, outstanding shares 3,101,761 3,185,353
NSM Holding Co LLC    
Cash $ 96.3 $ 56.3