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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Sac Holdings [Member]        
Related party notes receivable:        
Cash interest payments $ 15.4 $ 15.6    
Related party costs and expenses:        
Cash flow, related party 1.2 1.2    
Revenue generated by the dealer agreement from related parties $ 14.3 14.3    
Private Mini [Member]        
Related party costs and expenses:        
Commission expenses, generated from dealer agreement with related parties     $ 46.7 $ 51.3
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]        
Property Management Fee [Abstract]        
Property Management Fee Revenue     $ 17.0 $ 16.9
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:        
Payments For Purchase Of Other Assets 1 $ 214.5 $ 245.0