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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Income taxes computed at Federal statutory rate | $ (64.7) | $ 46.8 | $ (47.1)
Foreign affiliate dividends | (37.5) | (329.1) | (84.2)
Foreign operations subject to different income tax rates | (235.7) | 7.1 | (14.6)
State income tax | (8.5) | (21.2) | (6.0)
Remeasurement of opening U.S. deferred tax liabilities due to the Tax Act | 0.0 | (165.0) | 0.0
Additional remeasurements of originating deferred tax assets and liabilities | 0.0 | 75.6 | 0.0
Transaction costs | 0.0 | 0.0 | 7.3
Permanent differences | 6.8 | 3.5 | (0.5)
Nondeductible settlement costs | 16.9 | 0.0 | 0.0
Other | 0.3 | (5.3) | (2.3)
Increase (decrease) in valuation allowance | 313.9 | 68.2 | (1.5)
Total benefit for income taxes | $ (8.5) | $ (319.4) | $ (148.9)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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