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Revolving Credit Facility and DIP Facility (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Apr. 30, 2021	Dec. 31, 2020	Sep. 25, 2020
Debt Instrument [Line Items]
Long-term Debt		$ 544.8
Letters of Credit Outstanding, Amount	$ 36.5
Debtor-in-Possession Financing, Amount Arranged				$ 500.0
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt	545.3		$ 7,096.3
Reported Value Measurement [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 0.0		581.0
Line of Credit [Member] | Reported Value Measurement [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt			581.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			27.0
Portion Identified as binding [Member] | Credit Facility due 2019 [Member]
Debt Instrument [Line Items]
Current borrowing capacity			$ 1,600.0

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Amount debtor-in-possession financing arranged (but not necessarily all borrowed).

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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