Retirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

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						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Service cost	$	7.1		$	7.6		$	21.0		$	22.8
Interest cost		4.6			4.7			13.9			19.3
Expected return on plan assets		(10.1	)		(10.2	)		(30.3	)		(35.6	)
Curtailment gain (loss)		0.2			(0.4	)		0.4			(1.0	)
Amortization of prior service cost		(2.6	)		(1.9	)		(7.7	)		(5.8	)
Amortization of unrecognized actuarial loss		5.4			5.1			16.2			15.1
Net periodic pension expense	$	4.6		$	4.9		$	13.5		$	14.8