|
Concentration of Credit Risk (Schedule of Concentration Of Credit Risk) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Concentration Risk [Line Items] | ||
| Revenues | $ 339.2 | |
| Credit Concentration Risk | ||
| Concentration Risk [Line Items] | ||
| Revenues | $ 48.9 | $ 47.6 |
| Concentration Risk, Percentage | 14.40% | 13.80% |