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Basis of Presentation and Summary of Significant Accounting Policies - Longevity Swap Insurance Contract (Details)
£ in Millions
6 Months Ended
Jun. 30, 2022
GBP (£)
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Pension plan, longevity swap, hedged amount £ 950.0
Pension plan obligation, percentage 50.00%