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Revolving Credit Facility and DIP Facility (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 115.1
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt	7,096.3	$ 6,048.3
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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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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