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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 7,145.4	$ 5,010.4
Estimated Fair Value	5,734.4	3,545.8
Long-term Debt, Current Maturities	1,125.3	0.0
Short-term Debt, Fair Value	921.2
LONG-TERM DEBT	6,020.1	$ 5,010.4
Long-term Debt, Fair Value	$ 4,813.2
7.88% Senior Notes Due 2019 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	7.88%	7.88%
Carrying Value	$ 202.0	$ 0.0
Estimated Fair Value	$ 201.9	$ 0.0
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	6.875%	6.875%
Carrying Value	$ 126.2	$ 127.5
Estimated Fair Value	$ 122.4	$ 121.6
Four Point Seven Zero Percent Senior Notes Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	4.70%	4.70%
Carrying Value	$ 113.0	$ 112.7
Estimated Fair Value	$ 105.8	$ 101.8
4.875%SeniorNotesDue2022Member [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	4.58%	4.58%
Carrying Value	$ 595.0	$ 0.0
Estimated Fair Value	$ 572.6	$ 0.0
Three percent exchangeable senior notes due twenty twenty four [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	3.00%	3.00%
Carrying Value	$ 682.8	$ 666.8
Estimated Fair Value	666.4	575.5
Three percent exchangeable senior notes due twenty twenty four [Member] | Convertible Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
3.00% exchangeable senior notes, excluding discount and net of debt issuance costs	$ 837.4	$ 836.3
Four Point Five Percent Senior Notes Member [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	4.50%	4.50%
Carrying Value	$ 620.1	$ 619.8
Estimated Fair Value	$ 467.7	$ 405.2
4.75% Senior Notes Due 2024 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	4.75%	4.75%
Carrying Value	$ 339.5	$ 0.0
Estimated Fair Value	$ 304.0	$ 0.0
8.00% senior notes due 2024 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	8.00%	8.00%
Carrying Value	$ 336.5	$ 337.0
Estimated Fair Value	$ 282.2	$ 273.7
7.38% Senior Notes Due 2025 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	7.38%	7.38%
Carrying Value	$ 452.5	$ 0.0
Estimated Fair Value	$ 388.3	$ 0.0
Five Point Two Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	5.20%	5.20%
Carrying Value	$ 664.8	$ 664.4
Estimated Fair Value	$ 494.1	$ 443.9
Seven Point Seven Five Percent Senior Notes Due Two Thousand Twenty Six [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	7.75%	7.75%
Carrying Value	$ 986.1	$ 985.0
Estimated Fair Value	$ 750.7	$ 725.5
Seven Point Two Zero Percent Debentures Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	7.20%	7.20%
Carrying Value	$ 149.4	$ 149.3
Estimated Fair Value	$ 114.8	$ 109.1
Seven Point Eight Seven Five Percent Senior Notes Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	7.875%	7.875%
Carrying Value	$ 374.2	$ 375.0
Estimated Fair Value	$ 205.9	$ 223.2
5.40% Senior Notes Due 2042 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	5.40%	5.40%
Carrying Value	$ 261.9	$ 0.0
Estimated Fair Value	$ 237.9	$ 0.0
5.75% Senior notes due 2044
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	5.75%	5.75%
Carrying Value	$ 973.4	$ 972.9
Estimated Fair Value	$ 585.9	$ 566.3
5.85% Senior Notes Due 2044 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument interest rate stated percentage	5.85%	5.85%
Carrying Value	$ 268.0	$ 0.0
Estimated Fair Value	$ 233.8	$ 0.0

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-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, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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3.00% exchangeable senior notes, excluding discount and net of debt issuance costs

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