Debt (details) - Payment - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 20, 2016 |
Jun. 30, 2016 |
|
| Debt Instrument | ||
| Debt, principal amount repaid | $ 400 | |
| 6.25% Senior notes due June 20, 2016 [Member] | ||
| Debt Instrument | ||
| Debt, principal amount repaid | $ 400 | |
| Interest rate (percent) | 6.25% |