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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Sac Holdings [Member]        
Related party costs and expenses:        
Payments to aquire assets, other $ 0.4      
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]        
Property Management Fee [Abstract]        
Management fees received exclusive of reimbursed expenses 31.2   $ 29.0 $ 30.0
Related party costs and expenses:        
Revenue, excluding dealer agreement commissions and expenses 25.5      
Expenses, related parties 2.6      
Cash flow, related party 22.6      
Revenue, generated by the dealer agreement from related parties 323.8      
Commission expenses, generated from dealer agreement with related parties $ 69.2      
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Minimum [Member]        
Property Management Fee [Abstract]        
Management fee rate 4.00%      
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] | Maximum [Member]        
Property Management Fee [Abstract]        
Management fee rate 10.00%      
Amerco, Uhaul Intl [Member]        
Related party notes receivable:        
Notes receivable, related party   $ 12.0    
Debt Instrument, Interest Rate, Stated Percentage [Abstract]        
Debt instrument, interest rate, stated percentage   4.00%    
Surplus note, payment term   seven years