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Leases (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Lease, Cost [Table Text Block] | The Company has operating leases for corporate offices, branch offices, and data centers. The following table includes certain information about these leases (dollars in millions).
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Components of lease expense — |  |  |  |  |  |
Operating lease expense |  | $ | 26.1 |  |  | $ | 25.4 |  |  | $ | 26.9 |
Short-term lease expense |  | 7.5 |  |  | 6.9 |  |  | 5.4 |
Variable lease expense |  | 5.7 |  |  | 4.8 |  |  | 5.1 |
|  | $ | 39.3 |  |  | $ | 37.1 |  |  | $ | 37.4 |
Weighted-average remaining lease term of operating leases |  | 3.9 years |  | 3.1 years |  | 3.2 years
Weighted-average discount rate of operating leases |  | 5.03 | % |  | 3.67 | % |  | 3.47 | %
Supplemental cash flow information — |  |  |  |  |  |
Cash paid for operating lease liabilities |  | $ | 26.3 |  | $ | 28.3 |  | $ | 29.1
Right-of-use assets obtained with lease liabilities |  | $ | 36.3 |  | $ | 15.6 |  | $ | 10.8
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | Future maturities of operating lease liabilities are as follows (in millions):
2024 |  | $ | 22.8 |
2025 |  | 19.3 |
2026 |  | 15.1 |
2027 |  | 10.5 |
2028 |  | 5.8 |
Thereafter |  | 2.5 |
Total future minimum lease payments |  | 76.0 |
Less: imputed interest |  | 7.4 |
|  | $ | 68.6 |

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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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