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Significant Accounting Policies - Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Intangible Assets          
Accumulated amortization $ 599.6   $ 599.6   $ 542.4
Amortization expense $ 28.7 $ 26.8 $ 57.2 $ 53.6  
Minimum          
Intangible Assets          
Useful life of intangible assets 4 years   4 years    
Maximum          
Intangible Assets          
Useful life of intangible assets 13 years   13 years