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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 3 Months Ended 39 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Dec. 31, 2021
Deferred costs associated with deferred revenue $ 143.3   $ 143.3 $ 143.3
Provision for Loss on Contract Change (0.5)      
Deferred revenue 287.8   287.8 288.1
Deferred revenue – change (0.3)      
Advances from customers, current 0.0      
Advances from customers, noncurrent - change 0.0      
Deferred revenue, revenue recognized (0.3) $ (28.5)    
Provision for Loss on Contracts Utilized (0.5) (2.0)    
Contract With Customer, Advances, Liability, Current 15.0   15.0 15.0
Deferred Revenue, Noncurrent 45.1   45.1 45.1
Government [Member]        
Provision for Loss on Contracts 0.0   0.0 $ 0.5
Provision for Loss on Contracts Utilized $ 0.5 $ (2.0) $ 19.6