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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 252 Months Ended 1 Months Ended
Feb. 28, 2014
Jul. 31, 2013
Feb. 28, 2013
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
item
Feb. 28, 2015
May 16, 2012
Common Stock                  
Number of common stock share authorized before amendment to Restated Articles of Incorporation                 100,000,000rs_CommonStockShareAuthorizedBeforeAmendment
Number of common stock shares authorized       200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized   200,000,000us-gaap_CommonStockSharesAuthorized   200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value (in dollars per share)                     
Votes per share of common stock       1rs_CommonStockNumberOfVotingRightsPerShare     1rs_CommonStockNumberOfVotingRightsPerShare    
Common stock quarterly dividend per share, after increase (in dollars per share) $ 0.35us-gaap_CommonStockDividendsPerShareDeclared $ 0.33us-gaap_CommonStockDividendsPerShareDeclared $ 0.30us-gaap_CommonStockDividendsPerShareDeclared $ 1.40us-gaap_CommonStockDividendsPerShareDeclared $ 1.26us-gaap_CommonStockDividendsPerShareDeclared $ 0.80us-gaap_CommonStockDividendsPerShareDeclared      
Common stock quarterly dividend per share, before increase (in dollars per share)     $ 0.25rs_CommonStockDividendsPerShareDeclaredBeforeIncrease            
Share Repurchase Plan                  
Number of shares repurchased under stock repurchase plan       759,800us-gaap_TreasuryStockSharesAcquired     16,000,000us-gaap_TreasuryStockSharesAcquired    
Average costs per share       $ 65.80rs_StockRepurchaseAcquiredAverageCostPerShare     $ 20.66rs_StockRepurchaseAcquiredAverageCostPerShare    
Value of shares repurchased       $ 50.0us-gaap_StockRepurchasedDuringPeriodValue          
Number of shares authorized by the Board of Directors to be repurchased under stock repurchase plan       7,123,233us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased     7,123,233us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased    
Preferred Stock                  
Preferred stock, authorized shares       5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized   5,000,000us-gaap_PreferredStockSharesAuthorized    
Preferred stock, par value (in dollars per share)                    
Minimum number of series in which preferred shares may be issued       1rs_PreferredStockSharesIssuanceNumberOfSeriesMinimum          
Subsequent event                  
Common Stock                  
Common stock quarterly dividend per share, after increase (in dollars per share)               $ 0.40us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
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