|
Income Taxes (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Income taxes | ||
| Valuation allowance | $ 0 | $ 0 |
| Unrecognized tax benefits | 7.9 | 7.9 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1.6 | 1.6 |
| State | ||
| Income taxes | ||
| Net operating loss resulting from repairs and maintenance deductions | 49.9 | 49.9 |
| Federal | ||
| Income taxes | ||
| Net operating loss resulting from repairs and maintenance deductions | $ 43.8 | $ 43.8 |