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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 Contractual interest rate for funds borrowed, under the debt agreement. + 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 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + 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 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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