|
Income Taxes (Operating Loss Carryforwards) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Internal Revenue Service (IRS) [Member] | ||
| Operating Loss Carryforwards [Line Items] | ||
| Operating loss carryforwards | $ 483.1 | $ 507.5 |
| State and Local Jurisdiction [Member] | ||
| Operating Loss Carryforwards [Line Items] | ||
| Operating loss carryforwards | $ 436.0 | $ 449.8 |