Retirement Benefits - Projected Benefit Obligation Assumptions (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	5.46%	2.79%	2.47%
Rate of compensation increase	0.08%	0.08%	0.24%
Discount rate	2.79%	2.47%	3.17%
Expected return on plan assets	4.59%	4.66%	4.69%
Rate of compensation increase	0.08%	0.24%	2.94%
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	5.50%	2.90%	2.50%
Rate of compensation increase	3.93%	3.87%	3.99%
Discount rate	2.90%	2.50%	3.30%
Rate of compensation increase	3.87%	3.99%	4.00%