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Tax credit carryforward (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2018 USD ($)
Tax Credit Carryforward [Line Items] |
Refundable foreign tax credits | $ 49.2
Foreign Tax Authority | Foreign Withholding Tax Credit |
Tax Credit Carryforward [Line Items] |
Tax credit carryforward, amount | 20.0
Tax credit carryforward, valuation allowance | $ 20.0
Foreign Tax Authority | Foreign Withholding Tax Credit | Minimum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforward, expiration date | Mar. 31, 2022
Foreign Tax Authority | Foreign Withholding Tax Credit | Maximum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforward, expiration date | Mar. 31, 2024
State and Local Jurisdiction |
Tax Credit Carryforward [Line Items] |
Tax credit carryforward, amount | $ 96.3
Tax credit carryforward, valuation allowance | $ 96.3
State and Local Jurisdiction | Minimum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforward, expiration date | Mar. 31, 2018
State and Local Jurisdiction | Maximum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforward, expiration date | Mar. 31, 2037

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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 + 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://www.xbrl.org/2003/role/presentationRef -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 Expiration date of the tax credit carryforward, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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