Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
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

Future cash outflow to pay for purchases of fixed assets that have occurred.

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