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Common and Preferred Shares and Warrants (Details 1) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) shares
Series B |
Preferred Shares [Line Items] |
Issuance Date | Nov. 10, 2014
Securities issued | 750
Depositary shares, issued | 750,000
Aggregate Liquidation Preference | $ | $ 750
Fixed dividend rate per annum | 5.20%
Semi-annual fixed dividend, payment dates | Beginning May 15, 2015
Floating dividend rate per annum | 3 month LIBOR+ 3.428%
Quarterly floating dividend, Payment Dates | Beginning February 15, 2020
Fixed to floating rate, conversion date | Nov. 15, 2019
Series C |
Preferred Shares [Line Items] |
Issuance Date | Mar. 02, 2015
Securities issued | 850
Depositary shares, issued | 850,000
Aggregate Liquidation Preference | $ | $ 850
Fixed dividend rate per annum | 4.90%
Semi-annual fixed dividend, payment dates | Beginning September 15, 2015
Floating dividend rate per annum | 3 month LIBOR+ 3.285%
Quarterly floating dividend, Payment Dates | Beginning June 15, 2020
Fixed to floating rate, conversion date | Mar. 15, 2020

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