Benefit Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2015

Benefit Plans and Other Postretirement Benefits

Schedule of components of net pension benefits

	Pension Benefits						Other Postretirement Benefits
	Three months ended September 30,
	2015			2014			2015		2014
Service cost	$	2.3		$	2.0		$	—	$	—
Interest cost	5.8			6.0			0.1		0.1
Expected return on plan assets	(7.3		)	(7.1		)	—		—
Amortization of prior service cost	0.6			0.7			—		—
Amortization of net actuarial losses	6.5			4.0			0.1		0.1
Net pension expense	$	7.9		$	5.6		$	0.2	$	0.2

	Pension Benefits						Other Postretirement Benefits
	Nine months ended September 30,
	2015			2014			2015		2014
Service cost	$	7.0		$	6.1		$	0.1	$	0.1
Interest cost	17.4			18.1			0.3		0.4
Expected return on plan assets	(21.8		)	(21.4		)	—		—
Amortization of transition obligation	(0.1		)	(0.1		)	—		—
Amortization of prior service cost	1.7			2.0			—		—
Amortization of net actuarial losses	19.4			12.1			0.2		0.3
Net pension expense	$	23.6		$	16.8		$	0.6	$	0.8