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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Provision for Loss on Contract Change $ (16.7)  
Deferred revenue 242.5 $ 258.4
Deferred revenue – change (15.9)  
Contract With Customer, Advances, Liability, Current 30.2 14.8
Advances from customers, current 15.4  
Deferred Revenue, Noncurrent 32.8 46.2
Advances from customers, noncurrent - change (13.4)  
Government [Member]    
Provision for Loss on Contracts $ 3.3 $ 20.0