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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Income Taxes [Line Items] |  |  |
Net interest and penalties recognized related to uncertain tax positions | $ 5.0 | $ 6.0 | $ 1.2
Accrued interest related to unrecognized tax benefits | 16.7 | $ 13.2 |
Unrecognized tax benefits that if realized would impact effective tax rate | 81.6 |  |
Unrecognized tax benefits estimated that may be realized in next 12 months | 79.7 |  |
Foreign Tax Authority | Canada |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 2.5 |  |
Foreign Tax Authority | Luxembourg |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 235.1 |  |
Foreign Tax Authority | Other Foreign |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 18.1 |  |
State and Local Jurisdiction |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 988.2 |  |
Domestic Tax Authority | United States |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 1,561.5 |  |
Credit carryforward | $ 73.0 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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