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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 |  |

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