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Pension and Employee Benefit Plans, Weighted-average Asset Allocations (Details) - Pension Plans [Member] - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |
Target allocation |  | 100.00% | 100.00% |
Plan assets |  | 100.00% | 100.00% |
Anticipated contributions next fiscal year |  | $ 3.0 |  |
Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |
Target allocation |  | 65.00% | 60.00% |
Plan assets |  | 66.00% | 58.00% |
Debt Securities [Member] |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |
Target allocation |  | 21.00% | 38.00% |
Plan assets |  | 19.00% | 38.00% |
Real Estate [Member] |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |
Target allocation |  | 13.00% | 0.00% |
Plan assets |  | 12.00% | 0.00% |
Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |
Target allocation |  | 1.00% | 2.00% |
Plan assets |  | 3.00% | 4.00% |
U.S. Plans [Member] |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |
Expected return on plan assets |  | 7.50% | 7.50% | 8.00%
U.S. Plans [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |
Expected return on plan assets | 7.50% |  |  |

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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