Retirement Plans

3 Months Ended

Mar. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Retirement Plans

10 Retirement Plans

The Company has contributory and non-contributory defined benefit pension plans covering employees at most operations in the U.S. and in certain other countries. The main plan is the U.S. plan for which the benefits are based on an average of the employee’s earnings in the years preceding retirement and on credited service. Certain supplemental funded and unfunded plan arrangements also provide retirement benefits to specified groups of participants.

The Company has frozen participation in the U.S. pension plans to include only those employees hired as of December 31, 2003. The U.K. defined benefit plan is the most significant individual non-U.S. pension plan and the Company has frozen participation to include only those employees hired as of April 30, 2003.

The Net Periodic Benefit Costs related to Other Post-retirement Benefits were not significant to the condensed consolidated financial statements of the Company for the three month periods ended March 31, 2017 and March 31, 2016 and are not included in the table below.

The components of total Net Periodic Benefit Cost associated with the Company’s defined benefit retirement plans are as follows:

	Three months ended
	March 31, 2017			March 31, 2016
Service cost	$	6.0		$	5.3
Interest cost		5.3			5.3
Expected return on plan assets		(5.3	)		(5.1	)
Amortization prior service credit		0.1			(0.2	)
Amortization of actuarial loss		2.0			1.5
Net Periodic Benefit Cost	$	8.1		$	6.8