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Income Taxes (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 21, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Income Taxes [Line Items] |  |  |  |
Federal statutory income tax rate | 21.00% | 35.00% | 21.00% |
Unrecognized tax benefits that if realized would impact effective tax rate |  |  | $ 17.6 |
Unrecognized tax benefits estimated that may be realized in next 12 months |  |  | 3.8 |
Foreign Tax Authority | Canada |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  |  | 106.9 |
Foreign Tax Authority | Luxembourg |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  |  | 947.0 |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  |  | 791.3 |
Domestic Tax Authority | United States |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards |  |  | 1,367.9 |
Credit carryforward |  |  | $ 74.2 |
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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