Retirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 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 September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Service cost	$	7.6		$	7.6		$	22.8		$	22.8
Interest cost		4.7			7.2			19.3			18.3
Expected return on plan assets		(10.2	)		(12.3	)		(35.6	)		(34.1	)
Curtailment gain		(0.4	)		—			(1.0	)		—
Amortization of prior service cost		(1.9	)		(1.1	)		(5.8	)		(3.4	)
Amortization of unrecognized actuarial loss		5.1			5.0			15.1			13.5
Net periodic pension expense	$	4.9		$	6.4		$	14.8		$	17.1