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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Jan. 31, 2022 | Jan. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  | $ (277.4) |
Accumulated Other Comprehensive Income (Loss), Ending Balance |  | (269.3) |
Foreign Currency Translation Adjustment [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  | (9.0) | $ (50.5)
Reclassification adjustments |  | 0.0 | 0.0
Current period credit (charge) |  | (9.0) | 29.4
Income tax benefit (expense) |  | 0.0 | 0.0
Accumulated Other Comprehensive Income (Loss), Ending Balance |  | (18.0) | (21.1)
Net Gains (Losses) on Cash Flow Hedging Derivatives [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | [1] | (174.8) | (185.6)
Reclassification adjustments | [1] | 9.8 | 10.4
Current period credit (charge) | [1] | 0.0 | 0.0
Income tax benefit (expense) | [1] | (1.4) | (2.2)
Accumulated Other Comprehensive Income (Loss), Ending Balance | [1] | (166.4) | (177.4)
Pension and Other Postretirement Liabilities [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | [2] | (97.3) | (146.7)
Reclassification adjustments | [2] | 12.6 | 39.0
Current period credit (charge) | [2] | (2.0) | 9.5
Income tax benefit (expense) | [2] | (2.0) | (11.8)
Accumulated Other Comprehensive Income (Loss), Ending Balance | [2] | (88.7) | (110.0)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  | 3.7 | 3.8
Reclassification adjustments |  | 0.0 | 0.0
Current period credit (charge) |  | 0.2 | 1.5
Income tax benefit (expense) |  | (0.1) | (0.3)
Accumulated Other Comprehensive Income (Loss), Ending Balance |  | 3.8 | 5.0
AOCI Attributable to Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance |  | (277.4) | (379.0)
Reclassification adjustments |  | 22.4 | 49.4
Current period credit (charge) |  | (10.8) | 40.4
Income tax benefit (expense) |  | (3.5) | (14.3)
Accumulated Other Comprehensive Income (Loss), Ending Balance |  | $ (269.3) | $ (303.5)
[1] | The reclassification is composed of deferred gains (losses) related to terminated interest rate contracts. During both 2022 and 2021, the reclassification was primarily from accumulated other comprehensive income (loss) to interest expense. In addition, during the first quarter of 2022, a portion of the reclassification was to other income (expense) – net, which was driven by the prepayment of the Senior Notes due March 15, 2022. For additional information, see Note 10: Derivative Financial Instruments.
[2] | The reclassification from accumulated other comprehensive income (loss) to other income (expense) – net is composed of settlement charges and amortization of net losses and prior service costs. The reclassification in 2021 primarily includes the impact of the nonrecurring settlement charge related to the Canadian buy-out contract. For additional information, see Note 9: Pensions and Other Postretirement Benefits.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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