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Financing Arrangements and Derivative Financial Instruments - Notes Textual (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2016
May 31, 2016
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]          
Redemption premium     $ 44,000,000 $ 44,000,000  
Senior Notes | 5% due 2026          
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 900,000,000      
Debt instrument, interest rate, stated percentage 5.00% 5.00% 5.00% 5.00% 5.00%
Notes sold as a percentage of principle amount   100.00%      
Percent of notes that may be redeemed with certain equity offerings       35.00%  
Redemption price as percentage of principal amount plus accrued and unpaid interest       105.00%  
Senior Notes | 5% due 2026 | Period Commencing May 31, 2021          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percentage       102.50%  
Senior Notes | 5% due 2026 | Period Commencing May 31, 2022          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percentage       101.667%  
Senior Notes | 5% due 2026 | Period Commencing May 31, 2023          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percentage       100.833%  
Senior Notes | 5% due 2026 | Period Commencing May 31, 2024          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percentage       100.00%  
Senior Notes | 5% due 2026 | Period Prior to May 31, 2021          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percentage       100.00%  
Senior Notes | 6.5% due 2021          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 6.50%   6.50% 6.50% 6.50%
Debt instrument, repurchased face amount $ 900,000,000   $ 900,000,000 $ 900,000,000  
Redemption premium 44,000,000        
Write-off of deferred financing fees $ 9,000,000