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Supplemental Cash Flow Information (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]    
Payments of interest and commitment fees $ 97.8 $ 107.5
Interest paid, capitalized 1.0 1.7
Incurred liabilities for fixed and intangible asset additions $ 25.5 $ 15.1