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Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended
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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

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