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(Aggregate Maturities Of Long-Term Debt) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Mar. 04, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | $ (951.8) |  | $ (721.8) | $ (595.4) |  |  |  |  |  |  |  |  |
Long-Term Debt, Gross | 6,515.3 |  |  |  |  |  |  | $ 6,049.5 |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | (311.2) | $ (1,093.1) |  |  |  |
Debt Instrument, Repurchased Face Amount Net of Debt Issuance | (12.8) |  | 1,367.1 |  | $ 515.8 |  |  |  |  |  |  |  |
Senior Notes [Member] | 6.875% Senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  | $ (71.4) | (229.9) |  | $ (328.0) | (219.2) |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 122.9 |  |  |  |  |  |  |  |  |  |  |  |
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges |  |  |  |  |  |  |  | 900.0 |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 900.0 |
Senior Notes [Member] | 4.70% Senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ (12.8) | (156.2) |  | (413.3) | $ (156.2) |  | (817.0) |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 100.7 |  |  |  |  |  |  |  |  |  |  |  |
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges |  |  |  |  |  |  |  | 1,500.0 |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500.0
Senior Notes [Member] | 4.875%SeniorNotesDue2022Member [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 620.8 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 620.8 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 4.50% Senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | (320.0) |  |  |  |  |  |  | (1.6) |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 303.4 |  |  |  |  |  |  |  |  |  |  |  |
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges |  |  |  |  |  |  |  | 625.0 |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 625.0 |  |
Senior Notes [Member] | 4.75%SeniorNotesDue2024Member [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | (79.5) |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 318.6 |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturities, Repayments of Principal after Year Five | 318.6 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 398.1 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 8.00% Senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | (39.7) |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 292.3 |  |  |  |  |  |  |  |  |  |  |  |
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges |  |  |  |  | 332.0 |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | 332.0 |  |  |  |  |
Senior Notes [Member] | 5.20% Senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | (335.5) |  |  |  |  |  |  | (30.8) |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 333.7 |  |  |  |  |  |  |  |  |  |  |  |
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges |  |  |  |  |  |  |  | 700.0 |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 700.0 |  |  |
Senior Notes [Member] | 7.38%SeniorNotesDue2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | (139.2) |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 360.8 |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturities, Repayments of Principal after Year Five | 360.8 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 500.0 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 7.75% Senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturities, Repayments of Principal after Year Five | 1,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 1,000.0 |  | $ 1,000.0 |  |  |  |  |  |  |  |
Senior Notes [Member] | 7.20% Senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | (37.9) |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturities, Repayments of Principal after Year Five | 112.1 |  |  |  |  |  |  |  |  |  |  |  |
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges |  |  |  |  |  |  |  | 150.0 |  |  |  |  |
Debt Instrument, Face Amount |  |  | 150.0 |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 7.875% Senior notes due 2040 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturities, Repayments of Principal after Year Five | 300.0 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | 300.0 |  |  |  | $ 300.0 |
Senior Notes [Member] | 5.40%SeniorNotesDue2042 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturities, Repayments of Principal after Year Five | 400.0 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 400.0 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 5.75% Senior notes due 2044 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | (24.5) |  |  |  |  |
Long-Term Debt, Maturities, Repayments of Principal after Year Five | 1,000.5 |  |  |  |  |  |  |  |  |  |  |  |
Face (Par) Amount of the Original Debt Instrument, Including Repurchases and Equity Exchanges |  |  |  |  |  |  |  | 1,025.0 |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 400.0 | $ 625.0 |  |
Senior Notes [Member] | 5.85%SeniorNotesDue2044 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturities, Repayments of Principal after Year Five | 400.0 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 400.0 |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 849.5 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 849.5 |  | $ 849.5 |  |  |  |  | $ 849.5 |  |  |  |  |

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