Discontinued Operations (Schedule of Condensed Statements of Income and Cash Flow of Financial Freedom Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total income (loss) from discontinued operations, net of taxes	$ (3.2)		$ 37.3	$ 214.0	$ 51.3
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income	5.5		20.5	34.8	58.3
Interest expense	(3.5)		(93.7)	(105.7)	(281.7)
Other income (losses)	5.7		(14.0)	(16.4)	24.0
Operating expenses	(14.1)		(66.1)	(15.8)	(373.6)
Income (loss) from discontinued operations before benefit (provision) for income taxes	(4.4)		38.9	164.4	(26.3)
Benefit (provision) for income taxes	2.5		(1.6)	(69.0)	77.6
Total income (loss) from discontinued operations, net of taxes	(3.2)		37.3	214.0	51.3
Net cash flows (used for) provided by operations				(1.1)	694.9
Net cash flows provided by (used in) investing activities				10,867.5	(393.0)
Financial Freedom | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income	2.5		2.8	8.0	8.8
Interest expense	(2.3)		(2.5)	(7.2)	(8.2)
Other income (losses)	5.7		(10.2)	(29.8)	7.3
Operating expenses	(13.1)		(38.5)	23.8	(299.1)
Income (loss) from discontinued operations before benefit (provision) for income taxes	(7.2)		(48.4)	(5.2)	(291.2)
Benefit (provision) for income taxes	2.8		18.5	2.0	90.1
Total income (loss) from discontinued operations, net of taxes	(4.4)		(29.9)	(3.2)	(201.1)
Salaries and benefits expense	5.0		5.0	14.0	11.0
Professional and legal services expense	1.0		7.0	9.0	16.0
Other expenses	$ 5.0		3.0	$ 9.0	11.0
Net (decrease) increase to servicing-related reserve			$ 230.0		$ 230.0
Tax rate for discontinued operations	39.00%		38.00%	38.00%	31.00%
Net cash flows (used for) provided by operations				$ (33.8)	$ (32.0)
Net cash flows provided by (used in) investing activities				84.3	69.8
Financial Freedom | Discontinued Operations | Residential Mortgage
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of mortgage servicing rights liability	$ 50.0	$ 50.0	$ 19.0		$ 19.0
Net release of curtailment reserve	111.0	111.0
Increase in other servicing related reserves	$ 40.0	$ 40.0
Net (decrease) increase to servicing-related reserve				$ (102.0)