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Schedule of Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 123.5 | $ 123.5
Accumulated intangible asset amortization | (82.0) | (77.8)
Amortizable intangible assets, net | $ 41.5 | 45.7
Average useful life of finite-lived intangible assets | 15 years |
Contract-Based Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 54.6 | 54.6
Accumulated intangible asset amortization | (40.7) | (39.9)
Amortizable intangible assets, net | 13.9 | 14.7
Customer-Related Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 68.9 | 68.9
Accumulated intangible asset amortization | (41.3) | (37.9)
Amortizable intangible assets, net | $ 27.6 | $ 31.0

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