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Employee Benefit Plans (Tables)
 3 Months Ended
Apr. 30, 2019
Retirement Benefits [Abstract]  
Periodic Pension and Other Postretirement Benefit Expense
Net periodic pension and other postretirement benefit expense included the following components:
 
 
Three Months Ended April 30,
 
 
Pension Benefits
 
Other
Postretirement Benefits
(in millions)
 
2019
 
2018
 
2019
 
2018
Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
Service cost
 
$
4.2

 
$
4.5

 
$
0.7

 
$
0.7

Interest cost
 
8.1

 
7.6

 
0.8

 
0.8

Expected return on plan assets
 
(8.7
)
 
(8.3
)
 
—

 
—

Amortization of prior service credit
 
—

 
—

 
(0.2
)
 
(0.2
)
Amortization of net loss
 
2.6

 
3.3

 
0.2

 
—

Net expense
 
$
6.2

 
$
7.1

 
$
1.5

 
$
1.3