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Operating Leases (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Lease, Cost | Operating lease charge. The following table summarizes the operating lease charge for the twelve months ended December 31, 2023, 2022 and 2021:
| For the Twelve Months Ended |  |
| December 31, 2023 |  | December 31, 2022 |  | December 31, 2021 |  |  |  |
| ($ in millions) |  |
Amortization charge on right-of-use operating leased assets | $ | 10.7 |  |  | $ | 10.1 |  |  | $ | 12.0 |  |  |  |  |
Interest on operating lease liabilities | 4.5 |  |  | 5.4 |  |  | 5.5 |  |  |  |  |
Operating lease charge | $ | 15.2 |  |  | $ | 15.5 |  |  | $ | 17.5 |  |  |  |  |
Lessee, Operating Lease, Liability | Lease Liabilities. The following table summarizes the maturity of lease liabilities under non-cancellable leases as of December 31, 2023 and 2022:
| December 31, 2023 |  | December 31, 2022 |  |  |  |
| ($ in millions) |  |
Operating leases — maturities |  |  |  |  |  |  |
2023 | $ | — |  |  | $ | 15.4 |  |  |  |  |
2024 | 15.4 |  |  | 15.2 |  |  |  |  |
2025 | 15.1 |  |  | 14.9 |  |  |  |  |
2026 | 14.3 |  |  | 14.1 |  |  |  |  |
2027 | 12.8 |  |  | 12.6 |  |  |  |  |
2028 | 12.7 |  |  | 12.4 |  |  |  |  |
Later years | 32.4 |  |  | 34.8 |  |  |  |  |
Total minimum lease payments | $ | 102.7 |  |  | $ | 119.4 |  |  |  |  |
Less imputed interest | (16.6) |  |  | (23.9) |  |  |  |  |
Total lease liabilities | $ | 86.1 |  |  | $ | 95.5 |  |  |  |  |
Summary of Other Lease Information | Other lease information. The following table summarizes the cash flows on operating leases for the twelve months ended December 31, 2023, 2022 and 2021 and other supplemental information:
| For the Twelve Months Ended |
| December 31, 2023 |  | December 31, 2022 |  | December 31, 2021 |
| ($ in millions) |
Cash paid for amounts included in the measurement of lease liabilities |  |  |  |  |  |
- Operating cash outflow from operating leases | $ | (15.5) |  |  | $ | (15.5) |  |  | $ | (17.5) |  |
Right-of-use assets obtained in exchange for lease obligations |  |  |  |  |  |
- Operating leases | $ | 0.2 |  |  | $ | 1.9 |  |  | $ | 23.9 |  |
Reduction to Right-of-use assets resulting from reductions to lease obligations |  |  |  |  |  |
- Operating leases | $ | 0.1 |  |  | $ | 7.0 |  |  | $ | 2.3 |  |
Weighted Averages |  |  |  |  |  |
- Operating leases, remaining lease terms (years) | 7.3 |  | 8.1 |  | 8.8 |
- Operating leases, average discount rate | 5.0 | % |  | 5.0 | % |  | 5 | % |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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