|
Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
Jun. 30, 2011
|
|---|---|---|---|
| Long-term Debt Types [Abstract] | |||
| Captial lease arrangments | $ 8.7 | $ 29.7 | |
| Long Term Debt By Current And Noncurrent [Abstract] | |||
| Current maturities of long-term debt | 30.8 | 28.7 | |
| Long-term debt | $ 337.5 | $ 335.3 |