Retirement Benefits - Schedule of Pension Plan's Asset Allocations by Asset Category (Details)	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Pension plans weighted average asset allocation	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plans weighted average asset allocation	5.00%	2.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plans weighted average asset allocation	47.00%	46.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Pension plans weighted average asset allocation	12.00%	15.00%
Registered investment companies
Defined Benefit Plan Disclosure [Line Items]
Pension plans weighted average asset allocation	1.00%	2.00%
Private assets
Defined Benefit Plan Disclosure [Line Items]
Pension plans weighted average asset allocation	10.00%	11.00%
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Pension plans weighted average asset allocation	25.00%	24.00%