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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
metalproduct
M
Location
state
Dec. 31, 2010
Summary of Significant Accounting Policies    
Minimum number of locations in which company operates metal service network 220  
Number of states in which the company operates metal service center network 38  
Minimum number of metal products distributes by the company 100,000  
Fair Values of Financial Instruments    
Carrying value, before deducting unamortized discount or premiums $ 1,332.8 $ 943.1
Cash Equivalents    
Maximum term of original maturity to classify instruments as cash and cash equivalents (in months) 3  
Senior Unsecured Notes - Publicly Traded
    
Fair Values of Financial Instruments    
Carrying value, before deducting unamortized discount or premiums 600.0  
Fair value 638.1 612.1
Carrying value $ 598.4 $ 598.2