Retirement Benefit Plans (Tables)

6 Months Ended

Jun. 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						Six Months Ended
	June 30,						June 30,
	2017			2016			2017			2016
Service cost	$	6.4		$	7.7		$	13.9		$	15.2
Interest cost		4.6			7.4			9.3			14.6
Expected return on plan assets		(10.1	)		(12.7	)		(20.2	)		(25.4	)
Curtailment gain		0.2			(0.3	)		0.2			(0.6	)
Amortization of prior service cost		(2.5	)		(2.0	)		(5.1	)		(3.9	)
Amortization of unrecognized actuarial loss		5.2			5.0			10.8			10.0
Net periodic pension expense	$	3.8		$	5.1		$	8.9		$	9.9