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Other Financial Instruments and Fair Value Measurements (Tables)
 9 Months Ended
Jan. 31, 2019
Fair Value Disclosures [Abstract]  
Carrying amount and fair value of financial instruments
The following table provides information on the carrying amounts and fair values of our financial instruments.
 
January 31, 2019
 
April 30, 2018
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Marketable securities and other investments
$
44.9

 
$
44.9

 
$
45.8

 
$
45.8

Derivative financial instruments – net
(39.5
)
 
(39.5
)
 
9.7

 
9.7

Total long-term debt
$
(5,585.1
)
 
$
(5,486.1
)
 
$
(4,688.0
)
 
$
(4,579.8
)
Financial assets (liabilities) measured at fair value on a recurring basis
The following tables summarize the fair values and the levels within the fair value hierarchy in which the fair value measurements fall for our financial instruments.
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Fair Value at January 31, 2019
Marketable securities and other investments: (A)
 
 
 
 
 
 
 
Equity mutual funds
$
9.0

 
$
—

 
$
—

 
$
9.0

Municipal obligations
—

 
35.9

 
—

 
35.9

Money market funds
—

 
—

 
—

 
—

Derivative financial instruments: (B)
 
 
 
 
 
 
 
Commodity contracts – net
(2.3
)
 
(0.2
)
 
—

 
(2.5
)
Foreign currency exchange contracts – net
(0.1
)
 
0.7

 
—

 
0.6

Interest rate contracts
—

 
(37.6
)
 
—

 
(37.6
)
Total long-term debt (C)
(4,507.7
)
 
(978.4
)
 
—

 
(5,486.1
)
Total financial instruments measured at fair value
$
(4,501.1
)
 
$
(979.6
)
 
$
—

 
$
(5,480.7
)
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Fair Value at
April 30, 2018
Marketable securities and other investments: (A)
 
 
 
 
 
 
 
Equity mutual funds
$
9.3

 
$
—

 
$
—

 
$
9.3

Municipal obligations
—

 
36.1

 
—

 
36.1

Money market funds
0.4

 
—

 
—

 
0.4

Derivative financial instruments: (B)
 
 
 
 
 
 
 
Commodity contracts – net
7.2

 
1.0

 
—

 
8.2

Foreign currency exchange contracts – net
0.1

 
1.4

 
—

 
1.5

Total long-term debt (C)
(4,579.8
)
 
—

 
—

 
(4,579.8
)
Total financial instruments measured at fair value
$
(4,562.8
)
 
$
38.5

 
$
—

 
$
(4,524.3
)
 
(A)
Marketable securities and other investments consist of funds maintained for the payment of benefits associated with nonqualified retirement plans. The funds include equity securities listed in active markets, municipal obligations valued by a third party using valuation techniques that utilize inputs that are derived principally from or corroborated by observable market data, and money market funds with maturities of three months or less. Based on the short-term nature of these money market funds, carrying value approximates fair value. As of January 31, 2019, our municipal obligations are scheduled to mature as follows: $0.9 in 2019, $0.9 in 2020, $1.0 in 2021, $1.5 in 2022, and the remaining $31.6 in 2023 and beyond.
(B)
Level 1 commodity and foreign currency exchange derivatives are valued using quoted market prices for identical instruments in active markets. Level 2 commodity and foreign currency exchange derivatives are valued using quoted prices for similar assets or liabilities in active markets. The Level 2 interest rate contracts are valued using standard valuation techniques, the income approach, and observable Level 2 market expectations at the measurement date to convert future amounts to a single discounted present value. Level 2 inputs for the valuation of the interest rate contracts are limited to prices that are observable for the asset or liability. For additional information, see Note 12: Derivative Financial Instruments.
(C)
Long-term debt is composed of public Senior Notes classified as Level 1 and the Term Loan classified as Level 2. The public Senior Notes are traded in an active secondary market and valued using quoted prices. The fair value of the Term Loan is based on the net present value of each interest and principal payment calculated utilizing an interest rate derived from an estimated yield curve obtained from independent pricing sources for similar types of term loan borrowing arrangements.