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Supplemental Cash Flow Information (Narrative) (Details) - DNI [Member] - USD ($)
$ in Millions
1 Months Ended
May 31, 2019
Mar. 31, 2019
Dec. 31, 2020
Percentage of ownership interest prior to disposal 38.00% 55.00%  
Percentage of ownership interest after disposal 30.00% 38.00%  
Consideration received   $ 27.6 $ 6.0
Settlement of contingent consideration $ 15.0 $ 27.6