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Employee Benefit Plans (Notes)
 9 Months Ended
Oct. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
EMPLOYEE BENEFIT PLANS

The Company maintains several pension and retirement plans, and also provides certain health-care and life insurance benefits.

Net periodic pension and other postretirement benefit expense included the following components:
 
 
Three Months Ended October 31,
 
 
Pension Benefits
 
Other
Postretirement Benefits
(in millions)
 
2017
 
2016
 
2017
 
2016
Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
Service cost
 
$
4.3

 
$
4.4

 
$
0.7

 
$
0.7

Interest cost
 
7.9

 
7.9

 
0.8

 
0.8

Expected return on plan assets
 
(8.2
)
 
(5.9
)
 
—

 
—

Amortization of prior service cost (credit)
 
0.1

 
—

 
(0.2
)
 
(0.2
)
Amortization of net loss
 
3.3

 
3.7

 
—

 
—

Net expense
 
$
7.4

 
$
10.1

 
$
1.3

 
$
1.3

 
 
Nine Months Ended October 31,
 
 
Pension Benefits
 
Other
Postretirement Benefits
(in millions)
 
2017
 
2016
 
2017
 
2016
Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
Service cost
 
$
13.0

 
$
13.1

 
$
2.1

 
$
2.1

Interest cost
 
23.9

 
23.7

 
2.2

 
2.3

Expected return on plan assets
 
(24.7
)
 
(17.6
)
 
—

 
—

Amortization of prior service cost (credit)
 
0.2

 
—

 
(0.5
)
 
(0.5
)
Amortization of net loss
 
9.9

 
11.0

 
—

 
—

Net expense
 
$
22.3

 
$
30.2

 
$
3.8

 
$
3.9



The Company maintains a noncontributory defined benefit pension plan qualified in accordance with the Internal Revenue Service Code ("Qualified Plan") covering substantially all U.S. employees hired before January 1, 2006. The Company funds the Qualified Plan's trust in accordance with regulatory limits to provide for current service and for the unfunded benefit obligation over a reasonable period and for current service benefit accruals. To the extent that these requirements are fully covered by assets in the Qualified Plan, the Company may elect not to make any contribution in a particular year. No cash contribution was required in the fiscal year ending January 31, 2017 and none is required in the fiscal year ending January 31, 2018 to meet the minimum funding requirements of the Employee Retirement Income Security Act. The Company periodically evaluates whether to make discretionary cash contributions to the Qualified Plan and made a voluntary cash contribution of $15.0 million in the three months ended October 31, 2017. The Company currently does not anticipate making additional discretionary contributions in the three months ending January 31, 2018. This expectation is subject to change based on management’s assessment of a variety of factors, including, but not limited to, asset performance, interest rates and changes in actuarial assumptions.