XML 70 R39.htm IDEA: XBRL DOCUMENT v3.23.3
Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
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