Defined Benefit Pension Plans (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
U.S. pension plans
Defined Benefit Plan Disclosure
Contributions by employer	$ 9,000,000	$ 9,000,000
Estimated future employer contributions	0
U.K. pension plans
Defined Benefit Plan Disclosure
Contributions by employer	4,564,000	$ 4,945,000
Estimated future employer contributions	$ 1,400,000