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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Deferred costs associated with deferred revenue $ 117.6 $ 135.7
Provision for Loss on Contracts 0.0 20.0
Provision for loss on contract change (20.0)  
Deferred revenue 252.4 258.4
Deferred revenue change (6.0)  
Advances from customers 30.2 14.8
Advances from customers change 15.4  
Contract with Customer, Advances, Liability, Noncurrent 32.8 $ 46.2
Advances from customers, noncurrent, change $ (13.4)