Stock Based Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended		3 Months Ended			9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014 Restricted Stock [Member]	Sep. 30, 2014 Vesting Based On Service [Member] Restricted Stock [Member]	Jun. 30, 2014 Vesting Based On Service [Member] Restricted Stock [Member]	Sep. 30, 2013 Vesting Based On Service [Member] Restricted Stock [Member]	Sep. 30, 2014 Vesting Based On Service [Member] Restricted Stock [Member]	Sep. 30, 2013 Vesting Based On Service [Member] Restricted Stock [Member]	Apr. 07, 2014 Capitalsource, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares authorized under the 2003 Plan	19,686,565	19,686,565
Additional number of common shares authorized under the 2003 Plan		10,686,565
Number of shares available for grant under the 2003 Plan	13,524,674	13,524,674
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number				1,115,550			1,115,550
Vesting period of time-based restricted stock, lower limit	300.00%
Vesting period of time-based restricted stock, higher limit	4
Business Acquisition, Effective Date of Acquisition									Apr. 07, 2014
Awarded shares of restricted common stock vested due to the triggering of the change of control provision contained within the 2003 Plan	1,013,377	1,013,377
Expense incurred due to awarded shares of restricted common stock vested due to the triggering of the change of control provision contained within the 2003 Plan	$ 26.1
Allocated Share-based Compensation Expense				2.9	2.4	2.4	6.9	6.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options			$ 39.2