Retirement Benefits (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Components of net periodic pension expense
Company contributions			$ 9,000,000
Defined Benefit Pension Plans | Minimum
Components of net periodic pension expense
Expected future benefit payments	30,000,000		30,000,000
Defined Benefit Pension Plans | Maximum
Components of net periodic pension expense
Expected future benefit payments	60,000,000		60,000,000
Defined Benefit U.S. Pension Plans
Components of net periodic pension expense
Service cost	1,614,000	1,490,000	3,227,000	2,979,000
Interest cost	7,275,000	8,324,000	14,550,000	16,647,000
Expected return on assets	(7,744,000)	(8,831,000)	(15,488,000)	(17,662,000)
Amortization of prior service cost	25,000	(29,000)	51,000	(57,000)
Recognized net actuarial loss	1,510,000	3,408,000	3,020,000	6,817,000
Net periodic pension expense	2,680,000	4,362,000	5,360,000	8,724,000
Defined Benefit Non-U.S. Pension Plans
Components of net periodic pension expense
Service cost	3,814,000	1,931,000	7,696,000	3,894,000
Interest cost	7,919,000	8,184,000	15,936,000	16,448,000
Expected return on assets	(11,421,000)	(10,497,000)	(22,980,000)	(21,077,000)
Recognized net actuarial loss	1,675,000	782,000	3,375,000	1,566,000
Net periodic pension expense	$ 1,987,000	$ 400,000	$ 4,027,000	$ 831,000