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Acquisitions - Racine (Details) (Racine Federated Inc, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Jan. 31, 2012
Dec. 31, 2013
Minimum
Customer relationships
Dec. 31, 2013
Maximum
Customer relationships
Business Acquisition        
Percentage of the outstanding common stock of Racine Federated, Inc. (as a percentage)   100.00%    
Purchase price in cash   $ 57.3    
Working capital adjustment   0.3    
Final payment included in payables $ 4.6      
Estimated average useful life (in years)     10 years 15 years