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Employee Benefit Plans (Tables)
 6 Months Ended
May 31, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
Net periodic benefit cost (income) consisted of the following for the three and six month periods ending May 31, 2019 and 2018:
 
Pension
Plans
 
Health Care
Plans
 
(Dollars in millions)
Three months ended May 31, 2019 and 2018
2019
 
2018
 
2019
 
2018
Service costs
$
.7

 
$
.7

 
$
—

 
$
—

Interest costs
2.6

 
2.2

 
—

 
—

Expected return on plan assets
(3.9
)
 
(3.9
)
 
—

 
—

Amortization of net actuarial (gain) loss
1.2

 
1.3

 
(.3
)
 
(.2
)
Net periodic cost (benefit)
$
.6

 
$
.3

 
$
(.3
)
 
$
(.2
)
 
 
Pension
Plans
 
Health Care
Plans
 
(Dollars in millions)
Six months ended May 31, 2019 and 2018
2019
 
2018
 
2019
 
2018
Service costs
$
1.4

 
$
1.3

 
$
—

 
$
—

Interest costs
5.1

 
4.5

 
.1

 
.1

Expected return on plan assets
(7.8
)
 
(7.8
)
 
—

 
—

Amortization of net actuarial (gain) loss
2.3

 
2.7

 
(.6
)
 
(.5
)
Net periodic cost (benefit)
$
1.0

 
$
.7

 
$
(.5
)
 
$
(.4
)