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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 |  |

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- Definition These agreements and notes with subsidiaries of SAC Holdings, 4 SAC, 5 SAC, Galaxy and Private Mini, Excluded Dealer Agreements commission expenses. + References No definition available. + Details
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- Definition The amount of revenue received excluding any revenue generated from dealer commissions or expenses as part of the dealer contract between the Company and these related party entities. + References No definition available. + Details
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- Definition Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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