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Revenues from Contracts with Customers - Contract Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Contract costs      
Contract cost asset $ 193.1 $ 173.0  
Practical expedient, incremental costs of obtaining a contract true    
Impairment loss for contract cost asset $ 0.0 0.0 $ 0.0
Amortization expense of contract cost asset $ 32.4 $ 24.8 $ 24.4