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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Income Taxes [Line Items] |  |  |
Unrecognized tax benefits that if realized would impact effective tax rate | $ 12.1 | $ 64.9 |
Net interest and penalties recognized related to uncertain tax positions | (8.9) | 5.0 | $ 6.0
Accrued interest related to unrecognized tax benefits | 7.0 | $ 16.7 |
Settlement of prior year refund claim, income tax benefit recognized | 70.0 |  |
Accrued interest and penalties | 10.0 |  |
Unrecognized tax benefits estimated that may be realized in next 12 months | 8.1 |  |
Foreign Tax Authority | Canada |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 361.6 |  |
Foreign Tax Authority | Luxembourg |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 504.3 |  |
Foreign Tax Authority | Other Foreign |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 24.6 |  |
Foreign Tax Authority | SPAIN |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 96.1 |  |
Foreign Tax Authority | UNITED KINGDOM |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 95.1 |  |
State and Local Jurisdiction |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 1,203.9 |  |
Domestic Tax Authority | United States |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | 1,330.6 |  |
Credit carryforward | $ 64.9 |  |

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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 -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + 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 -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482620/740-10-25-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482620/740-10-25-10 + 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 -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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- Definition Amount accrued 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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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