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Income Taxes (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 21, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Income Taxes [Line Items] |  |  |  |  |
Federal statutory income tax rate | 21.00% | 35.00% |  |  |
Tax benefit from change in rate |  |  | $ 165.0 |  |
Income tax benefit |  |  | (319.4) | $ (148.9) | $ (76.5)
Net Tax Benefit |  |  | 259.1 |  |
Tax benefit from foreign affiliate dividends |  |  | 162.3 |  |
Unrecognized tax benefits that if realized would impact effective tax rate |  |  | 15.7 |  |
Foreign Tax Authority |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Charge from increases in valuation allowance |  |  | 9.4 |  |
Foreign Tax Authority | Canada |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards |  |  | 132.5 |  |
State and Local Jurisdiction |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards |  |  | 712.8 |  |
Domestic Tax Authority |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Charge from increases in valuation allowance |  |  | 58.8 |  |
Domestic Tax Authority | United States |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards |  |  | 1,260.5 |  |
Credit carryforward |  |  | $ 68.3 |  |
Pro Forma |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Federal statutory income tax rate |  |  | 31.50% |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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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