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Retirement Benefits - Net Periodic Pension Expense for Defined Benefit Pension Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net periodic pension expense for defined benefit pension plans      
Loss on settlement     $ 239,896
Defined Benefit Pension Plans      
Net periodic pension expense for defined benefit pension plans      
Service cost $ 18,780 $ 19,507  
Interest cost 22,525 26,435  
Defined Benefit Pension Plans | U.S.      
Net periodic pension expense for defined benefit pension plans      
Service cost     6,800
Interest cost     16,116
Expected return on assets     (19,711)
Amortization of prior service credit     867
Recognized net actuarial loss     9,714
Loss on settlement     250,946
Net periodic pension expense     264,732
Defined Benefit Pension Plans | Non-U.S.      
Net periodic pension expense for defined benefit pension plans      
Service cost 18,780 19,507 20,517
Interest cost 22,525 26,435 26,511
Expected return on assets (40,272) (39,535) (49,066)
Amortization of prior service credit (828) (813) (814)
Recognized net actuarial loss 7,890 8,819 7,681
Loss on settlement 184 396 390
Net periodic pension expense $ 8,279 $ 14,809 $ 5,219