Income Taxes Tax Return Filing Determinations and Elections (Details) - USD ($) $ in Millions |
8 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Aug. 19, 2009 |
Oct. 06, 2009 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income Tax Contingency [Line Items] | |||||
| Acquisition Date | Oct. 06, 2009 | ||||
| Formation of LLP | Aug. 19, 2009 | ||||
| Income Tax Contingency, Federal Statutory Rate for Foreign Shareholders | 30.00% | ||||
| Effective tax rate | 17.00% | 16.00% | 16.00% | ||
| Internal Revenue Service (IRS) [Member] | IRS NOPA | |||||
| Income Tax Contingency [Line Items] | |||||
| Adjustment recorded | $ 0 | ||||
| Minimum | IRS NOPA | |||||
| Income Tax Contingency [Line Items] | |||||
| Income Tax Contingency, Increased Future Effective Tax Rate | 20.00% | ||||
| Maximum | IRS NOPA | |||||
| Income Tax Contingency [Line Items] | |||||
| Income Tax Contingency, Increased Future Effective Tax Rate | 22.00% | ||||