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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of property, plant and equipment | The basis for depreciation of the cost of an item and their estimated useful lives based on their usage is as follows:
Asset |  | Basis |  | Rate / term
Land improvements and site improvements |  | Declining balance |  | 10 | %
Buildings and building improvements |  | Straight-line |  | 15 - 30 years
Yard, automotive and office equipment |  | Declining balance |  | 20 - 30%
Computer software and equipment |  | Straight-line |  | 3 - 5 years
Leasehold improvements |  | Straight-line |  | Lesser of lease term or economic life
At December 31, 2023 |  | Cost |  | Accumulated depreciation |  | Net book value
Land |  | $ | 549.2 |  |  | $ | — |  |  | $ | 549.2 |
Buildings and improvements |  | 491.1 |  |  | (236.1) |  |  | 255.0 |
Yard, automotive and office equipment |  | 306.0 |  |  | (117.5) |  |  | 188.5 |
Computer software and equipment |  | 108.2 |  |  | (79.5) |  |  | 28.7 |
Leasehold improvements |  | 160.0 |  |  | (37.3) |  |  | 122.7 |
Assets under development |  | 56.8 |  |  | — |  |  | 56.8 |
|  | $ | 1,671.3 |  |  | $ | (470.4) |  |  | $ | 1,200.9 |
At December 31, 2022 |  | Cost |  | Accumulated depreciation |  | Net book value
Land |  | $ | 169.4 |  |  | $ | — |  |  | $ | 169.4 |
Buildings and improvements |  | 444.4 |  |  | (220.5) |  |  | 223.9 |
Yard, automotive and office equipment |  | 124.4 |  |  | (83.1) |  |  | 41.3 |
Computer software and equipment |  | 83.0 |  |  | (72.5) |  |  | 10.5 |
Leasehold improvements |  | 23.4 |  |  | (16.7) |  |  | 6.7 |
Assets under development |  | 7.3 |  |  | — |  |  | 7.3 |
|  | $ | 851.9 |  |  | $ | (392.8) |  |  | $ | 459.1 |
Schedule of finite-lived intangible assets | Amortization is recognized in earnings on a straight-line basis over the estimated useful lives of intangible assets from the date that they are available for use. The amortization periods of finite-lived intangible assets are re-evaluated periodically when facts and circumstances indicate that the remaining useful lives may have changed. Indefinite-lived trade names and trademarks are not amortized. The estimated useful lives of the Company's intangible assets are as follows:
Asset |  | Rate / term
Trade names and trademarks |  | 2 - 15 years or indefinite-lived
Customer relationships |  | 6 - 20 years
Software and technology assets |  | 3 - 7 years
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 |
Backlog |  | 1.1 |  |  | (1.1) |  |  | — |
|  | $ | 3,455.4 |  |  | $ | (541.3) |  |  | $ | 2,914.1 |
At December 31, 2022 |  | Cost |  | Accumulated amortization |  | Net book value
Trade names and trademarks |  | $ | 54.0 |  |  | $ | (2.9) |  |  | $ | 51.1 |
Customer relationships |  | 245.4 |  |  | (85.6) |  |  | 159.8 |
Software and technology assets |  | 289.1 |  |  | (182.3) |  |  | 106.8 |
Software under development |  | 4.5 |  |  | — |  |  | 4.5 |
Backlog |  | 1.1 |  |  | (0.6) |  |  | 0.5 |
|  | $ | 594.1 |  |  | $ | (271.4) |  |  | $ | 322.7 |

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