Employee Benefit Plans (Tables)

6 Months Ended

Jul. 31, 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 July 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2019			2018			2019			2018
Net Periodic Benefit Cost:
Service cost	$	4.3		$	4.4		$	0.6		$	0.7
Interest cost	8.2			7.8			0.9			0.8
Expected return on plan assets	(9.7		)	(8.4		)	—			—
Amortization of prior service credit	—			—			(0.1		)	(0.2		)
Amortization of net loss (gain)	3.0			4.2			(0.2		)	—
Net expense	$	5.8		$	8.0		$	1.2		$	1.3

	Six Months Ended July 31,
	Pension Benefits						Other Postretirement Benefits
(in millions)	2019			2018			2019			2018
Net Periodic Benefit Cost:
Service cost	$	8.5		$	8.9		$	1.3		$	1.5
Interest cost	16.3			15.4			1.7			1.6
Expected return on plan assets	(18.4		)	(16.7		)	—			—
Amortization of prior service credit	—			—			(0.3		)	(0.4		)
Amortization of net loss	5.6			7.5			—			—
Net expense	$	12.0		$	15.1		$	2.7		$	2.7