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Debt (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Other Lines of Credit and Long-term Debt [Line Items]  
Credit facility, maximum borrowing capacity $ 206.5
Primary revolving line of credit
  
Other Lines of Credit and Long-term Debt [Line Items]  
Credit facility, maximum borrowing capacity 200.0
Credit facility, interest rate basis LIBOR
Credit facility, interest rate spread (as a percent) 0.27%
Credit facility, interest rate at end of period (as a percent) 0.51%
Commitment fees payable on unused portion of the facility (as a percent) 0.08%
Other revolving credit lines and long term debt
  
Other Lines of Credit and Long-term Debt [Line Items]  
Total Borrowing Capacity 10.2
Credit facility, interest rate low end of range (as a percent) 1.60%
Credit facility, interest rate high end of range (as a percent) 3.80%
Total outstanding balances 3.8
Long-term portion of balance $ 0.2