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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Deferred costs associated with deferred revenue $ 143.3 $ 151.9
Provision for Loss on Contracts 0.5 7.0
Provision for loss on contract change (6.5)  
Provision for loss on contracts, noncurrent 0.0 0.7
Provision for loss on contracts, noncurrent, change (0.7)  
Deferred revenue 288.1 281.7
Deferred revenue change 6.4  
Advances from customers 15.0 1.5
Advances from customers change 13.5  
Advances from customers, noncurrent 45.1 $ 45.2
Advances from customers, noncurrent, change $ (0.1)