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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Income taxes computed at Federal statutory rate |  | $ 46.8 | $ (47.1) | $ (11.8)
Foreign affiliate dividends |  | (329.1) | (84.2) | (59.4)
Foreign and provincial operations subject to different income tax rates |  | 7.1 | (14.6) | (7.1)
State income tax |  | (21.2) | (6.0) | (3.8)
Remeasurement of opening U.S. deferred tax liabilities due to the Tax Act | $ (165.0) | (165.0) | 0.0 | 0.0
Additional remeasurements of originating deferred tax assets and liabilities |  | 75.6 | 0.0 | 0.0
Transaction costs |  | 0.0 | 7.3 | 0.0
Permanent differences |  | 3.5 | (0.5) | 6.5
Other |  | (5.3) | (2.3) | (0.9)
Increase (decrease) in valuation allowance |  | 68.2 | (1.5) | 0.0
Total benefit for income taxes |  | $ (319.4) | $ (148.9) | $ (76.5)

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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