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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Deferred costs associated with deferred revenue $ 137.2 $ 137.2   $ 151.9
Provision for Loss on Contract Change   (3.9)    
Provision for Loss on Contract Noncurrent Change   (0.7)    
Deferred revenue 259.1 259.1   281.7
Deferred revenue – change   (22.6)    
Advances from customers, current 16.9 16.9   1.5
Customer advances – change   15.4    
Advances from customer, noncurrent 45.1 45.1   45.2
Advances from customers, noncurrent - change   (0.1)    
Deferred revenue, revenue recognized   (28.5) $ 0.0  
Provision for Loss on Contracts Total 3.1 3.1    
Provision for Loss on Contracts Utilized 4.6   $ 5.3  
Government [Member]        
Provision for Loss on Contracts 3.1 3.1   7.0
Provision for loss on contracts, noncurrent $ 0.0 $ 0.0   $ 0.7