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Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross $ 2,503.6 $ 2,489.8
Accumulated amortization (1,343.7) (1,326.5)
Impairment (477.0) (467.9)
Intangible assets 682.9 695.4
Permits and leasehold agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 1,540.2 1,535.5
Accumulated amortization (907.7) (893.8)
Intangible assets 632.5 641.7
Franchise agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 944.0 934.8
Accumulated amortization (428.8) (426.4)
Impairment (477.0) (467.9)
Intangible assets 38.2 [1] 40.5
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross 19.4 19.5
Accumulated amortization (7.2) (6.3)
Intangible assets $ 12.2 $ 13.2
[1] We reclassified all Prepaid MTA equipment deployment costs (see Note 16. Commitments and Contingencies) and recorded impairments in the second, third and fourth quarters of 2023, as well as the first quarter of 2024, due to the long-term outlook of our U.S. Transit and Other reporting unit.