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Retirement Benefits - Change in Projected Benefit Obligation and Plan Assets and Funded Status of Defined Benefit Pension Plans (Details) - Defined Benefit Pension Plans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Change in projected benefit obligation    
Benefit obligation at beginning of year $ 987,989 $ 911,550
Service cost 18,780 19,507
Defined Benefit Plan, Interest Cost 22,525 26,435
Employee contributions 3,112 3,272
Currency translation 118,411 (80,418)
Actuarial (gain) loss (15,437) 96,216
Plan amendments (1,058)  
Benefits paid (33,948) (33,695)
Settlements (2,281)  
Acquisitions   55,799
Other   (10,677)
Benefit obligation at end of year 1,098,093 987,989
Change in plan assets    
Plan assets at beginning of year 950,947 920,477
Actual return on plan assets 38,657 124,210
Company contributions 15,283 14,868
Employee contributions 3,112 3,272
Currency translation 114,436 (88,852)
Benefits paid (33,948) (33,695)
Settlements (2,281)  
Acquisitions   21,923
Other   (11,256)
Plan assets at end of year 1,086,206 950,947
Funded Status - (Under)/overfunded amounts (11,887) (37,042)
Amounts recognized in the Consolidated Balance Sheet    
Accumulated other comprehensive loss (pre-tax) 235,495 231,225
Amount of accumulated other comprehensive loss expected to be recognized as components of net periodic pension expense in next fiscal year 7,000  
Pension plans with accumulated benefit obligations in excess of plan assets    
Projected benefit obligations in excess of plan assets 702,000  
Fair value of plan assets for plans with projected benefit obligations in excess of plan assets 650,000  
The total accumulated benefit obligation 1,000,000 919,000
Other accrued liabilities    
Amounts recognized in the Consolidated Balance Sheet    
Pension liabilities included in other accrued liabilities (2,208) (2,001)
Noncurrent liabilities    
Amounts recognized in the Consolidated Balance Sheet    
Pension liabilities included in noncurrent liabilities (49,891) (66,018)
Other assets    
Amounts recognized in the Consolidated Balance Sheet    
Pension assets included in other assets $ 40,212 $ 30,977