Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

	Three months ended						Six months ended
In millions	June 30, 2019			June 30, 2018			June 30, 2019			June 30, 2018
Service cost	$	0.7		$	1.0		$	1.4		$	2.1
Interest cost	2.7			3.0			5.4			6.0
Expected return on plan assets	(1.7		)	(2.2		)	(3.4		)	(4.5		)
Plan settlement gain	(12.2		)	—			(12.2		)	—
Net periodic benefit (income) expense	$	(10.5	)	$	1.8		$	(8.8	)	$	3.6