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Debt, Debt Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Mar. 28, 2013
Line of Credit [Member]
    
Credit Facilities [Line Items]    
Credit facility borrowing capacity $ 250.0 $ 230.0
Maturity date Mar. 31, 2018  
Description of applicable margin calculation based on utilization percentage Amounts drawn under the facility bear interest at 90-day LIBOR plus an applicable margin. The applicable margin varies with the percentage of the total commitment drawn, with a 3.25% margin at 25% or lower utilization, a 3.75% margin at utilization greater than 25% but less than or equal to 50%, and a 4.25% margin at greater than 50% utilization. For purposes of determining the interest rate, in no event will LIBOR be less than 0.5% per annum. The Company is also required to pay a quarterly commitment fee of 0.5% per annum on the unused portion of the facility.  
Quarterly commitment fee 0.50%  
Line of credit availability 250.0  
Credit facility borrowings outstanding 12.0  
Line of Credit [Member] | Maximum [Member]
    
Credit Facilities [Line Items]    
Credit facility borrowing capacity 350.0  
Swingline Line of Credit [Member]
    
Credit Facilities [Line Items]    
Credit facility borrowing capacity 25.0  
Secured and Unsecured Letter of Credit Facilities
    
Credit Facilities [Line Items]    
Credit facility borrowing capacity 84.5  
Credit facility borrowings outstanding $ 71.6