Income Taxes Tax Return Filing Determinations and Elections (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 8 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Aug. 19, 2009 |
Oct. 06, 2009 |
|
| Loss Contingencies [Line Items] | ||||||
| Income Tax Contingency, Federal Statutory Rate for Foreign Shareholders | 30.00% | |||||
| Effective tax rate | 18.00% | 13.00% | 17.00% | 15.00% | ||
| Acquisition Date | Oct. 06, 2009 | |||||
| Formation of LLP | Aug. 19, 2009 | |||||
| Internal Revenue Service (IRS) | IRS NOPA | ||||||
| Loss Contingencies [Line Items] | ||||||
| Adjustment Recorded | $ 0 | |||||
| Minimum | IRS NOPA | ||||||
| Loss Contingencies [Line Items] | ||||||
| Income Tax Contingency, Increased Annual Effective Tax Rate | 20.00% | |||||
| Maximum | IRS NOPA | ||||||
| Loss Contingencies [Line Items] | ||||||
| Income Tax Contingency, Increased Annual Effective Tax Rate | 22.00% | |||||