Retirement Benefits

The components of net periodic benefit credit included in our consolidated statements of income for the three months ended September 30, 2017 and 2016 are as follows:



	Pension Benefits						Other Benefits
	Three Months Ended September 30						Three Months Ended September 30
	2017			2016			2017			2016
Service cost	$	2.6		$	2.9		$	0.3		$	0.3
Interest cost	16.6			17.3			5.2			5.6
Expected return on assets	(36.9		)	(36.7		)	(5.7		)	(5.6		)
Recognized actuarial loss	5.4			4.5			2.9			3.1
Settlement loss	2.9			1.1			—			—
Amortization of prior service credit	(0.1		)	(0.2		)	(3.4		)	(3.4		)
Net periodic benefit credit	$	(9.5	)	$	(11.1	)	$	(0.7	)	$	—

The components of net periodic (benefit credit) benefit cost included in our consolidated statements of income for the nine months ended September 30, 2017 and 2016 are as follows:



	Pension Benefits						Other Benefits
	Nine Months Ended September 30						Nine Months Ended September 30
	2017			2016			2017			2016
Service cost	$	7.6		$	8.6		$	1.0		$	1.1
Interest cost	49.9			51.9			15.6			16.8
Expected return on assets	(110.7		)	(110.1		)	(17.0		)	(16.8		)
Recognized actuarial loss	16.3			13.2			8.6			9.3
Settlement loss	6.7			6.7			—			—
Amortization of prior service credit	(0.3		)	(0.4		)	(10.2		)	(10.3		)
Net periodic (benefit credit) benefit cost	$	(30.5	)	$	(30.1	)	$	(2.0	)	$	0.1

For the year ending December 31, 2017, no material contributions are expected to be necessary to meet the Employee Retirement Income Security Act, or ERISA, required funding levels; however, we may elect to make discretionary contributions up to the maximum amount deductible for income tax purposes. Contributions of $0.2 were made to our retirement benefit plans during the three and nine months ended September 30, 2017. Contributions of $0.3 were made to our retirement benefit plans during the three and nine months ended September 30, 2016.