Retirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Components of Net Pension Expense

The components of net periodic pension expense for our U.S. and foreign defined benefit pension plans are as follows (in millions):

	Three Months Ended March 31,
	2016			2015
Service cost	$	7.5		$	7.6
Interest cost		7.2			5.5
Expected return on plan assets		(12.7	)		(10.9	)
Curtailment gain		(0.3	)		—
Amortization of prior service cost		(1.9	)		(1.1	)
Amortization of unrecognized actuarial loss		5.0			4.3
Net periodic pension expense	$	4.8		$	5.4