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Income Taxes (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 21, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Taxes [Line Items] |  |  |  |
Federal statutory income tax rate | 35.00% | 21.00% | 21.00% |
Unrecognized tax benefits that if realized would impact effective tax rate |  | $ 12.8 |  |
Unrecognized tax benefits estimated that may be realized in next 12 months |  | 4.9 |  |
Foreign Tax Authority | Canada |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  | 57.2 |  |
Foreign Tax Authority | Luxembourg |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  | 768.8 |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  | 881.2 |  |
Domestic Tax Authority | United States |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  | 1,660.6 |  |
Credit carryforward |  | $ 76.2 |  |
Pro Forma |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal statutory income tax rate |  |  |  | 31.50%

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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 http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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