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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Provision for Loss on Contract Change $ (0.5)  
Deferred revenue 249.5 $ 288.1
Deferred revenue – change (38.6)  
Contract With Customer, Advances, Liability, Current 15.3 15.0
Advances from customers, current 0.3  
Deferred Revenue, Noncurrent 46.2 45.1
Advances from customers, noncurrent - change 1.1  
Government [Member]    
Provision for Loss on Contracts $ 0.0 $ 0.5