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Subsidiary Preferred Stock (Details) (Series A Preferred Stock, USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Series A Preferred Stock
 
Subsidiary preferred stock  
Cash paid for redemption of preferred stock $ 70.9us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Subsidiary preferred stock, shares outstanding 75,000us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember