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Revenues from Contracts with Customers - Contract Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Contract costs          
Contract cost asset $ 156.5   $ 156.5   $ 157.0
Practical expedient, incremental costs of obtaining a contract     true    
Impairment loss for contract cost asset     $ 0.0 $ 0.0  
Amortization expense of contract cost asset $ 5.6 $ 6.4 $ 17.6 $ 18.2