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Contract Assets and Liabilities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred Income Tax Expense Benefit Provision For Gain Loss On Extinguishment Of Debt    
Increase in contract assets $ 21.6  
Increase in contract liabilities 3.4  
Revenue recognized $ 6.0 $ 3.2