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Debt (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | $ 649,500,000 |
Debt Instrument, Repurchase Amount |  |  | 664,500,000 |
8.50% Senior Notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 145,800,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 261,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.50% |  |  |
6.875% Senior Notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 129,800,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | $ 550,100,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% |  |  | 6.875%
4.70% Senior Notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | $ 373,900,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | $ 302,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% |  |  |
All Senior Notes due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | $ 1,800,000,000 |  |  |
Five year credit facility | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 2,250,000,000 |  |  |
Line of Credit Facility, Commitment Fee Percentage | 0.225% |  |  |
Maximum Percent of Debt to Total Capitalization Ratio | 60.00% |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 500,000,000 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | $ 0 |  |  | $ 0
Five year credit facility | Revolving Credit Facility [Member] | Base Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |
Five year credit facility | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |  |  |
Credit Facility maturing in 2019 [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 1,120,000,000 |  |  |
Credit Facility maturing in 2020 [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 1,130,000,000 |  |  |
Scenario, Forecast [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 34,800,000 |  |
Debt Instrument, Repurchase Amount |  | $ 37,900,000 |  |
Senior Notes [Member] | 8.50% Senior Notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.50% |
Senior Notes [Member] | 6.875% Senior Notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.875% |
Senior Notes [Member] | 4.70% Senior Notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% |  | 4.70% |
Senior Notes [Member] | Scenario, Forecast [Member] | 8.50% Senior Notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.50% |  |
Senior Notes [Member] | Scenario, Forecast [Member] | 6.875% Senior Notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.875% |  |
Senior Notes [Member] | Scenario, Forecast [Member] | 4.70% Senior Notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.70% |  |
Open Market Repurchases [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Repurchased Face Amount | $ 4,400,000 |  |  |
Debt Instrument, Repurchase Amount | $ 4,200,000 |  |  |

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