Schedule of Benefit Obligation and Net Periodic Benefit Cost for Plan (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Discount rate	2.00%	1.30%
Expected return on assets	3.00%	2.30%
RPI inflation	3.25%	2.90%
CPI inflation - pre 2030	2.25%	1.90%
CPI inflation - post 2030	3.05%	2.70%
Pension increases - pre-2006 service	3.15%	2.90%
Pension increases - post-2006 service	2.20%	2.10%
Pension increases - post 1988 GMP - pre 2030	2.10%	1.80%
Pension increases - post 1988 GMP - post 2030	2.60%	2.40%