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Revenue from Contracts with Customers - Contract Asset and Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Receivables, net, current $ 793.2 $ 815.4  
Increase (decrease) in receivables (22.2)    
Contract Liabilities, current 23.4 18.9  
Contract Liabilities, noncurrent 91.0 83.7  
Deferred revenue 5.5 (17.9) $ 10.7
Contract with customer, liability, revenue recognized 22.7 $ 48.6  
Other Current Liabilities [Member]      
Deferred revenue 4.5    
Other Noncurrent Liabilities [Member]      
Deferred revenue $ 7.3