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Revenue and Contracts with Customers (Contract with Customer Asset and Liability) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred costs associated with deferred revenue $ 151.9 $ 144.1
Provision for Loss on Contracts 7.0 10.0
Provision for loss on contract change (3.0)  
Provision for loss on contracts, noncurrent 0.7 8.3
Provision for loss on contracts, noncurrent, change (7.6)  
Deferred revenue 281.7 243.0
Deferred revenue change 38.7  
Advances from customers 1.5 23.3
Advances from customers change (21.8)  
Advances from customers, noncurrent 45.2 $ 29.4
Advances from customers, noncurrent, change $ 15.8