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Long-Term Debt - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Minimum
Dec. 31, 2013
Maximum
Nov. 26, 2013
Financing Agreement
Dec. 31, 2013
Financing Agreement
Nov. 26, 2013
Financing Agreement
Revolving Credit Facility
Dec. 31, 2013
Financing Agreement
Revolving Credit Facility
Minimum
Dec. 31, 2013
Financing Agreement
Revolving Credit Facility
Maximum
Dec. 31, 2013
Financing Agreement
Term loan
Nov. 26, 2013
Financing Agreement
Term loan
Dec. 31, 2012
Financing Agreement
Term loan
Dec. 31, 2013
Financing Agreement
Term loan
Minimum
Long-Term Debt (Textual) [Abstract]                          
Revolving credit and term loan agreement         $ 275   $ 75       $ 200    
Write off of unamortized deferred loan fees         4.6                
Revolving credit facility, amount outstanding that triggers net leverage ratio (percent)               20.00%          
Variable interest rate, floor                         0.75%
LIBOR plus margin range               2.25% 2.75% 2.50%      
Base interest rate                   3.25%      
Weighted average interest rate                   3.66%   4.22%  
Scheduled principal payments on long-term debt in 2014 2.0                        
Scheduled principal payments on long-term debt in 2015 2.0                        
Scheduled principal payments on long-term debt in 2016 2.0                        
Scheduled principal payments on long-term debt in 2017 2.0                        
Scheduled principal payments on long-term debt in 2018 2.0                        
Scheduled principal payments on long-term debt 2019 and thereafter 190.0                        
Restricted payment for dividend and share repurchase, maximum           50              
Pro forma net leverage ratio           4.5              
Percentage of commitment fees of total unused commitment under revolving credit facility     0.30% 0.50%                  
Letters of credit outstanding amount $ 0.2 $ 1.1