Discontinued Operations - Cash Flow and Significant Non-Cash Items (Details) - Atlantic and Astound broadband markets - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Discontinued Operations, Disposed of by sale
Specified items of cash flow
Capital expenditures	$ 45.4
Non-cash operating activities
Operating lease additions	$ 0.7
Discontinued Operations, Held-for-sale
Specified items of cash flow
Capital expenditures		$ 62.7
Non-cash operating activities
Operating lease additions		0.7
Non-cash financing activities:
Capital expenditure accounts payable and accruals		$ 2.1

Amount of capital expenditure attributable to discontinued operations.

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

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Amount of increase (decrease) in obligation for operating lease.

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