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Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract] |  |
Payments of interest and commitment fees | $ 154.4 | $ 138.3
Interest paid, capitalized | 2.3 | 1.4
Incurred liabilities for fixed and intangible asset additions | $ 44.9 | $ 26.5

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