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Significant Accounting Policies - Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Intangible Assets          
Accumulated amortization $ 380.6   $ 380.6   $ 327.0
Amortization expense $ 26.8 $ 24.9 $ 53.6 $ 49.7  
Minimum          
Intangible Assets          
Useful life of intangible assets     7 years    
Maximum          
Intangible Assets          
Useful life of intangible assets     13 years