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Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross $ 2,513.4 $ 2,489.8
Accumulated amortization (1,361.4) (1,326.5)
Impairment (485.8) (467.9)
Intangible assets 666.2 695.4
Permits and leasehold agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 1,540.3 1,535.5
Accumulated amortization (921.2) (893.8)
Intangible assets 619.1 641.7
Franchise agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 953.7 934.8
Accumulated amortization (432.1) (426.4)
Impairment (485.8) (467.9)
Intangible assets [1] 35.8 40.5
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross 19.4 19.5
Accumulated amortization (8.1) (6.3)
Intangible assets $ 11.3 $ 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 and second quarters of 2024, due to the long-term outlook of our U.S. Transit and Other reporting unit.