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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Oct. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of accumulated other comprehensive income (loss)
The components of accumulated other comprehensive income (loss), including the reclassification adjustments for items that are reclassified from accumulated other comprehensive income (loss) to net income, are shown below.
Foreign
Currency
Translation
Adjustment
Net Gains (Losses)
on Cash Flow
Hedging
Derivatives (A)
Pension and
Other
Postretirement
Liabilities (B)
Unrealized 
Gain (Loss)
on Available-
for-Sale
Securities		Accumulated
Other
Comprehensive
Income (Loss)
Balance at May 1, 2020$(50.5)$(185.6)$(146.7)$3.8 $(379.0)
Reclassification adjustments— 6.9 5.2 — 12.1 
Current period credit (charge)15.2 — 35.3 0.8 51.3 
Income tax benefit (expense)— (1.6)(10.1)(0.2)(11.9)
Balance at October 31, 2020$(35.3)$(180.3)$(116.3)$4.4 $(327.5)

 Foreign
Currency
Translation
Adjustment
Net Gains (Losses)
on Cash Flow
Hedging
Derivatives (A)
Pension and
Other
Postretirement
Liabilities (B)
Unrealized
Gain (Loss)
on Available-
for-Sale
Securities		Accumulated
Other
Comprehensive
Income (Loss)
Balance at May 1, 2019$(35.5)$(40.4)$(110.0)$4.1 $(181.8)
Reclassification adjustments— 0.2 3.2 — 3.4 
Current period credit (charge)5.1 (97.1)— 0.5 (91.5)
Income tax benefit (expense)— 22.3 (0.7)(0.1)21.5 
Balance at October 31, 2019$(30.4)$(115.0)$(107.5)$4.5 $(248.4)
 
(A)The reclassification from accumulated other comprehensive income (loss) to interest expense was related to terminated interest rate contracts. The current period charge in 2020 is related to losses on the interest rate contracts entered into in November 2018 and June 2018 that were terminated in 2020. For additional information, see Note 9: Derivative Financial Instruments.
(B)Amortization of net losses and prior service costs was reclassified from accumulated other comprehensive income (loss) to other income (expense) – net. The current period charge in 2021 primarily includes the impact of the nonrecurring settlement charge related to the purchase of a group annuity contract to transfer the obligations of our Canadian defined benefit pension plan to an insurance company. For additional information, see Note 8: Pensions and Other Postretirement Benefits.