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Debt Schedule of Extinguishment of Debt - Tender Offers and Repurchases (Details) - Scenario, Forecast [Member]	Jul. 12, 2019 USD ($)
Debt Instrument [Line Items]
Aggregate Principal Amount Repurchased	$ 951,800,000
Debt Instrument, Repurchase Amount	724,100,000
Senior Notes | Four Point Five Percent Senior Notes Member [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount Repurchased	320,000,000.0
Debt Instrument, Repurchase Amount	240,000,000.0
Senior Notes | Five Point Two Percent Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount Repurchased	335,500,000
Debt Instrument, Repurchase Amount	250,000,000.0
Senior Notes | Seven Point Two Zero Percent Debentures Member
Debt Instrument [Line Items]
Aggregate Principal Amount Repurchased	37,900,000
Debt Instrument, Repurchase Amount	29,900,000
Senior Notes | 4.75% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount Repurchased	79,500,000
Debt Instrument, Repurchase Amount	61,200,000
Senior Notes | 7.38%SeniorNotesDue2025 [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount Repurchased	139,200,000
Debt Instrument, Repurchase Amount	109,200,000
Senior Notes | 8.00% senior notes due 2024 [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount Repurchased	39,700,000
Debt Instrument, Repurchase Amount	$ 33,800,000

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- Definition

Fair value amount of debt instrument that was repurchased.

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- Definition

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- Definition

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+ References

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