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Related Party Transactions (Narratives) (Details) - Sac Holdings, Mercury, Four Sac, Five Sac, Galaxy and Private Mini [Member] - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Related party notes receivable: |  |  |  |
Proceeds From Sale Of Property Held For Sale |  | $ 15.0 |  |
Payments To Acquire Buildings |  | $ 11.5 |  |
Property Management Fee [Abstract] |  |  |  |
Management fees received exclusive of reimbursed expenses | $ 29.0 |  | $ 30.0 | $ 29.5
Related party costs and expenses: |  |  |  |
Revenue, excluding dealer agreement commissions and expenses | 24.0 |  |  |
Expenses, related parties | 2.6 |  |  |
Cash flow, related party | 21.5 |  |  |
Revenue, generated by the dealer agreement from related parties | 293.6 |  |  |
Commission expenses, generated from dealer agreement with related parties | $ 62.1 |  |  |
Minimum [Member] |  |  |  |
Property Management Fee [Abstract] |  |  |  |
Management fee rate | 4.00% |  |  |
Maximum [Member] |  |  |  |
Property Management Fee [Abstract] |  |  |  |
Management fee rate | 10.00% |  |  |

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- Definition Cash generated from agreements and notes with SAC Holdings, Four SAC, Five SAC, Galaxy and Private Mini, excluding Dealer Agreements. + References No definition available. + Details
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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 Amount of revenue earned from products and services provided under the terms of contract, including, but not limited to, government contracts and construction contracts, classified as other. + 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 This provides just the cost and expense for SAC holdings. + References No definition available. + Details
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- Definition The cash outflow for acquisition of buildings (properties) whether for investment or use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The amount of revenue derived from managing real estate properties. + References No definition available. + Details
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- Details
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