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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate allowance for doubtful accounts	$ 42.8	$ 45.8
Asset retirement obligation	$ 55.5	$ 53.5
Stock Options, SARs and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS	62.5	58.7	53.7
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS	23.9	9.2	6.2

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Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 45
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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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