XML 140 R125.htm IDEA: XBRL DOCUMENT v3.7.0.1
Employee Retirement Plans - Weighted Average Rate of Assumptions for Asset Allocation Plans (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]    
Benefits increasing with RPI limited, percentage 5.00%  
Discount rate 2.85% 3.75%
Rate of compensation increases (Merchant Navy Officers Pension Fund only)   4.55%
Rate of future RPI inflation 3.20% 3.05%
Rate of future CPI inflation 2.10% 1.95%
Pension increases in payment 3.05% 2.90%
Long-term rate of return on assets 3.17% 4.50%