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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member]    
Property Management Fee [Abstract]    
Property Management Fee Revenue $ 10.1 $ 9.2
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%  
Sac Holdings, Four Sac, Five Sac, Galaxy, and Private Mini [Member]    
Related party costs and expenses:    
Revenue, excluding dealer agreement commissions and expenses $ 6.1  
Expenses, related parties 0.7  
Cash flow, related party 5.2  
Revenue generated by the dealer agreement from related parties 63.0  
Commission expenses, generated from dealer agreement with related parties $ 15.3