Benefit Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2017

Benefit Plans and Other Postretirement Benefits

Schedule of components of net pension expense

					Other Postretirement
	Pension Benefits				Benefits
Three Months Ended June 30:	2017		2016		2017		2016
Service cost	$	2.4	$	2.3	$	—	$	—
Interest cost		4.9		4.8		0.1		0.1
Expected return on plan assets		(7.7)		(7.7)		—		—
Amortization of prior service cost		0.7		0.5		—		—
Amortization of net actuarial losses		5.7		4.9		0.2		0.2
Net pension expense	$	6.0	$	4.8	$	0.3	$	0.3
Six Months Ended June 30:
Service cost	$	4.9	$	4.6	$	—	$	—
Interest cost		9.9		10.6		0.2		0.2
Expected return on plan assets		(15.5)		(15.2)		—		—
Amortization of prior service cost		1.4		1.1		—		—
Amortization of net actuarial losses		11.4		11.2		0.3		0.3
Net pension expense	$	12.1	$	12.3	$	0.5	$	0.5