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Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Supplemental Cash Flow Elements [Abstract] |  |
Payments of interest and commitment fees | $ 35.4 | $ 33.7
Interest paid, capitalized | 0.7 | 0.5
Incurred liabilities for fixed and intangible asset additions | $ 27.1 | $ 17.2

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