Benefit Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2017

Benefit Plans and Other Postretirement Benefits

Schedule of components of net pension expense

					Other Postretirement
	Pension Benefits				Benefits
Three Months Ended September 30:	2017		2016		2017		2016
Service cost	$	2.5	$	2.3	$	—	$	—
Interest cost		5.0		5.2		0.1		0.1
Expected return on plan assets		(7.8)		(7.6)		—		—
Amortization of prior service cost		0.7		0.6		—		—
Amortization of net actuarial losses		5.8		5.6		0.2		0.2
Net pension expense	$	6.2	$	6.1	$	0.3	$	0.3
Nine Months Ended September 30:
Service cost	$	7.3	$	6.9	$	—	$	0.1
Interest cost		14.9		15.8		0.3		0.3
Expected return on plan assets		(23.2)		(22.7)		—		—
Amortization of transition obligation		—		(0.1)		—		—
Amortization of prior service cost		2.1		1.7		—		—
Amortization of net actuarial losses		17.2		16.7		0.5		0.5
Net pension expense	$	18.3	$	18.3	$	0.8	$	0.9