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Lease Commitments (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Schedule of Total Lease Costs (Net) | The Company and its Affiliates currently lease office space and equipment under various operating leasing arrangements. The following table presents total lease costs (net):
|  | For the Years Ended December 31,
|  | 2021 |  | 2022 |  | 2023
Operating lease costs |  | $ | 33.8 |  |  | $ | 38.5 |  |  | $ | 36.4 |
Short-term lease costs |  | 0.8 |  |  | 1.0 |  |  | 1.1 |
Variable lease costs |  | 0.0 |  |  | 0.0 |  |  | 0.0 |
Sublease income |  | (7.9) |  |  | (7.7) |  |  | (6.5) |
Total lease costs (net) |  | $ | 26.7 |  |  | $ | 31.8 |  |  | $ | 31.0 |
Schedule of the Company's Maturity of Lease Liabilities | As of December 31, 2023, the maturities of lease liabilities were as follows:
Year |  | Operating Leases
2024 |  | $ | 39.1 |
2025 |  | 35.0 |
2026 |  | 25.9 |
2027 |  | 21.9 |
2028 |  | 21.8 |
Thereafter |  | 68.3 |
Total undiscounted lease liabilities(1) |  | $ | 212.0 |
___________________________ (1)Total undiscounted lease liabilities were $29.3 million greater than the operating leases recorded in Other liabilities primarily due to present value discounting. Both amounts exclude leases with initial terms of 12 months or less and leases that have not yet commenced.

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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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