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Segment Information (Total Revenues of Reportable Segments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues $ 3,173,707 $ 3,008,740
Americas [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 1,703,046 1,787,349
CANADA    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 315,096 276,082
EMEA [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 481,925 398,075
Asia Pacific [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 634,385 525,682
Corporate and Other [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 39,255 21,552
Life Insurance Product Line [Member] | Americas [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 1,489,694 1,488,503
Life Insurance Product Line [Member] | CANADA    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 302,319 264,275
Life Insurance Product Line [Member] | EMEA [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 393,782 318,086
Life Insurance Product Line [Member] | Asia Pacific [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 614,539 505,230
Nontraditional Long-Duration Contracts [Member] | Americas [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 213,352 298,846
Nontraditional Long-Duration Contracts [Member] | CANADA    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 12,777 11,807
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 88,143 79,989
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues $ 19,846 $ 20,452