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Subsequent Events (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
May 01, 2015
Subsequent Event [Line Items]      
Cash dividends declared per share (in dollars per share) $ 0.195us-gaap_CommonStockDividendsPerShareDeclared $ 0.185us-gaap_CommonStockDividendsPerShareDeclared  
Subsequent Event | Common Stock      
Subsequent Event [Line Items]      
Cash dividends declared per share (in dollars per share)     $ 0.195us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Dividends declared     $ 11.2us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember