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Income Taxes - Additional Information (Details) $ in Millions, $ in Millions | 12 Months Ended | 60 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2021 AUD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 AUD ($)
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Tax loss carry-forwards | $ 61.0 |  |  |  |  |
Recognized tax deduction | 110.9 | $ 154.3 |  |  |  |
Contribution to AICF | 153.3 |  | $ 108.9 | $ 103.0 | $ 558.5 | $ 771.7
Foreign tax credit carry-forwards | 122.1 |  | $ 114.2 |  | $ 114.2 |
Prepaid Taxes | 30.5 |  |  |  |  |
Income tax paid, net of refunds | 3.7 |  |  |  |  |
Estimated tax refund, CARES Act | 42.3 |  |  |  |  |
Current taxes receivable, CARES Act | 25.3 |  |  |  |  |
Reduction in non-current taxes payable, CARES Act | 17.0 |  |  |  |  |
Income tax benefit, CARES Act | 4.9 |  |  |  |  |
Total amount of unrecognized tax benefits | 0.5 |  |  |  |  |
Interest and penalties recognized income tax expense | 0.5 |  |  |  |  |
Foreign Tax Credit Carry-Forwards |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Foreign tax credit carry-forwards | 119.5 |  |  |  |  |
Research tax credit carry-forwards | $ 2.6 |  |  |  |  |
Percentage of valuation allowance against loss carry-forwards (as percent) | 100.00% |  |  |  |  |

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- Definition The tax deduction relating to the AICF contribution. + References No definition available. + Details
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- Definition Under the terms of the Amended and Restated Final Funding Agreement (AFFA), a wholly owned Australian subsidiary (the Performing Subsidiary) has an obligation to make payments to the AICF on an annual basis. The amount of these annual payments is dependent on several factors, including the Company's free cash flow (as defined by the AFFA), actuarial estimations, actual claims paid, operating expenses of the AICF and the annual cash flow cap. + References No definition available. + Details
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- Definition Percentage of valuation allowance against loss carry forwards. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: 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 http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: 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 http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 + Details
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