Employee Benefits - Narrative (Details) $ in Millions	Mar. 31, 2024 USD ($)
U.K.
Defined Benefit Plan Disclosure [Line Items]
Expected future employer cash contribution	$ 2
Other
Defined Benefit Plan Disclosure [Line Items]
Expected future employer cash contribution	13
U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected future employer cash contribution	$ 53