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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Property Management Fee [Abstract]    
Property Management Fee Revenue $ 27.1 $ 24.5
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%  
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member]    
Related party costs and expenses:    
Revenue, excluding dealer agreement commissions and expenses $ 21.6  
Expenses, related parties 1.8  
Cash flow, related party 19.8  
Revenue generated by the dealer agreement from related parties 335.3  
Commission expenses, generated from dealer agreement with related parties $ 70.5