Benefit Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2015

Benefit Plans and Other Postretirement Benefits

Schedule of components of net pension benefits

	Pension Benefits						Other Postretirement Benefits
	Three months ended June 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
	Six months ended June 30,
	2015			2014			2015		2014
Service cost	$	4.7		$	4.1		$	—	$	0.1
Interest cost	11.6			12.1			0.2		0.2
Expected return on plan assets	(14.6		)	(14.3		)	—		—
Amortization of prior service cost	1.2			1.3			—		—
Amortization of net actuarial losses	12.9			8.0			0.2		0.2
Net pension expense	$	15.8		$	11.2		$	0.4	$	0.5