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Intangible Assets | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 18. Intangible Assets
At December 31, 2024 |  | Cost |  | Accumulated amortization |  | Net book value
Trade names and trademarks |  | $ | 220.5 |  |  | $ | (63.2) |  |  | $ | 157.3 |
Customer relationships |  | 2,538.1 |  |  | (393.7) |  |  | 2,144.4 |
Software and technology assets |  | 781.1 |  |  | (416.9) |  |  | 364.2 |
Software under development |  | 2.8 |  |  | — |  |  | 2.8 |
|  | $ | 3,542.5 |  |  | $ | (873.8) |  |  | $ | 2,668.7 |
At December 31, 2023 |  | Cost |  | Accumulated amortization |  | Net book value
Trade names and trademarks |  | $ | 221.9 |  |  | $ | (29.7) |  |  | $ | 192.2 |
Customer relationships |  | 2,553.1 |  |  | (225.0) |  |  | 2,328.1 |
Software and technology assets |  | 670.4 |  |  | (285.5) |  |  | 384.9 |
Software under development |  | 8.9 |  |  | — |  |  | 8.9 |
|  | $ | 3,454.3 |  |  | $ | (540.2) |  |  | $ | 2,914.1 |
At December 31, 2024, a net carrying amoun t of $52.7 million (December 31, 2023: $59.0 million) included in intangible assets was not subject to amortization, $49.9 million of which relates to certain trade names and trademarks and the remainder relates to software under development. During the year ended December 31, 2024, interest of $1.0 million (2023: $1.6 million; 2022: $0.4 million) was capitalized to the cost of software under development. At December 31, 2024, estimated annual amortization expense for the next five years ended December 31 are as follows:
2025 | $ | 340.2 |
2026 | 319.3 |
2027 | 244.9 |
2028 | 192.9 |
2029 | 178.7 |
| $ | 1,276.0 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/985-20/tableOfContent + Details
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