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Derivative Financial Instruments (Tables)
 12 Months Ended
Apr. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair value of derivative instruments
The following tables set forth the gross fair value amounts of derivative instruments recognized in the Consolidated Balance Sheets.
  
 
April 30, 2018
  
Other
Current
Assets
 
Other
Current
Liabilities
 
Other
Noncurrent
Assets
 
Other
Noncurrent
Liabilities
 
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
14.8

 
$
6.8

 
$
0.4

 
$
0.2

Foreign currency exchange contracts
 
2.2

 
0.7

 
—

 
—

Total derivative instruments
 
$
17.0

 
$
7.5

 
$
0.4

 
$
0.2

  
 
April 30, 2017
  
Other
Current
Assets
 
Other
Current
Liabilities
 
Other
Noncurrent
Assets
 
Other
Noncurrent
Liabilities
 
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
 
Commodity contracts
 
$
5.2

 
$
21.2

 
$
—

 
$
—

Foreign currency exchange contracts
 
3.2

 
0.1

 
—

 
—

Total derivative instruments
 
$
8.4

 
$
21.3

 
$
—

 
$
—
Net realized and unrealized gains and losses recognized in cost of products of sold on derivatives not designated as qualified hedging instruments
The following table presents the net gains and losses recognized in cost of products sold on derivatives not designated as hedging instruments.
  
Year Ended April 30,
  
2018

 
2017

 
2016

Gains (losses) on commodity contracts
$
6.5

 
$
(45.2
)
 
$
(31.6
)
Gains (losses) on foreign currency exchange contracts
(5.9
)
 
9.8

 
2.0

Total gains (losses) recognized in costs of products sold
$
0.6

 
$
(35.4
)
 
$
(29.6
)
Schedule of unallocated derivative (losses) gains
The following table presents the activity in unallocated derivative gains and losses.
  
Year Ended April 30,
  
2018

 
2017

 
2016

Net gains (losses) on mark-to-market valuation of unallocated derivative positions
$
0.6

 
$
(35.4
)
 
$
(29.6
)
Less: Net gains (losses) on derivative positions reclassified to segment operating profit
(36.7
)
 
(8.2
)
 
(41.6
)
Unallocated derivative gains (losses)
$
37.3

 
$
(27.2
)
 
$
12.0
Outstanding derivative contracts
The following table presents the gross contract notional value of outstanding derivative contracts.
  
Year Ended April 30,
  
2018

 
2017

Commodity contracts
$
658.0

 
$
704.9

Foreign currency exchange contracts
122.1

 
195.4