Retirement Plan (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
Compensation and Retirement Disclosure [Abstract] | |||
Pension expenses | $ 13.0 | $ 15.2 | $ 15.3 |