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Common Stockholders' Equity (Schedule of Changes in Shares of Common Stock Outstanding) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common Stock Shares Outstanding [Roll Forward]      
Balance, beginning of year 132,233,167us-gaap_CommonStockSharesOutstanding 136,017,732us-gaap_CommonStockSharesOutstanding 137,520,019us-gaap_CommonStockSharesOutstanding
Shares issued 332,137us-gaap_StockIssuedDuringPeriodSharesNewIssues 139,790us-gaap_StockIssuedDuringPeriodSharesNewIssues 2,114,168us-gaap_StockIssuedDuringPeriodSharesNewIssues
Shares repurchased (5,816,468)us-gaap_TreasuryStockSharesAcquired (3,924,355)us-gaap_TreasuryStockSharesAcquired (3,616,455)us-gaap_TreasuryStockSharesAcquired
Balance, end of year 126,748,836us-gaap_CommonStockSharesOutstanding 132,233,167us-gaap_CommonStockSharesOutstanding 136,017,732us-gaap_CommonStockSharesOutstanding