Retirement Benefits (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Components of net periodic pension expense
Company contributions	$ 7,000,000
Defined Benefit Pension Plans | Maximum
Components of net periodic pension expense
Expected future benefit payments	60,000,000
Defined Benefit Pension Plans | Minimum
Components of net periodic pension expense
Expected future benefit payments	30,000,000
Defined Benefit U.S. Pension Plans
Components of net periodic pension expense
Service cost	1,613,000	1,489,000
Interest cost	7,275,000	8,323,000
Expected return on assets	(7,744,000)	(8,831,000)
Amortization of prior service cost	26,000	(28,000)
Recognized net actuarial loss	1,510,000	3,409,000
Net periodic pension expense	2,680,000	4,362,000
Defined Benefit Non-U.S. Pension Plans
Components of net periodic pension expense
Service cost	3,882,000	1,963,000
Interest cost	8,017,000	8,264,000
Expected return on assets	(11,559,000)	(10,580,000)
Recognized net actuarial loss	1,700,000	784,000
Net periodic pension expense	$ 2,040,000	$ 431,000