Benefit Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2016

Benefit Plans and Other Postretirement Benefits

Schedule of components of net pension expense

	Pension Benefits						Other Postretirement Benefits
	2016			2015			2016		2015
Three months ended June 30:
Service cost	$	2.3		$	2.3		$	—	$	—
Interest cost	4.8			5.8			0.1		0.1
Expected return on plan assets	(7.7		)	(7.3		)	—		—
Amortization of prior service cost	0.5			0.6			—		—
Amortization of net actuarial losses	4.9			6.5			0.2		0.1
Net pension expense	$	4.8		$	7.9		$	0.3	$	0.2
Six months ended June 30:
Service cost	$	4.6		$	4.7		$	—	$	—
Interest cost	10.6			11.6			0.2		0.2
Expected return on plan assets	(15.2		)	(14.6		)	—		—
Amortization of prior service cost	1.1			1.2			—		—
Amortization of net actuarial losses	11.2			12.9			0.3		0.2
Net pension expense	$	12.3		$	15.8		$	0.5	$	0.4