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Investment Securities (Mortgage-backed Asset Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Investment securities
Fair value investments	$ 2,746.0	$ 2,328.7		$ 3,208.3
FNMA
Investment securities
Fair value investments	88.6	53.6
FHLMC
Investment securities
Fair value investments	60.5	38.1
GNMA
Investment securities
Fair value investments	30.8	23.7
Total Agency
Investment securities
Fair value investments	179.9	115.4
Total mortgage-backed securities
Investment securities
Fair value investments	179.9	115.4
Vehicle receivables
Investment securities
Fair value investments	15.1	9.2
Credit card receivables
Investment securities
Fair value investments	14.0	8.9
Total other asset-backed securities
Investment securities
Fair value investments	29.1	18.1
Total mortgage and asset- backed securities
Investment securities
Fair value investments	209.0	133.5
Level 2 Inputs
Investment securities
Fair value investments	1,109.6	1,160.5	$ 1,160.5	$ 2,105.4
Level 2 Inputs | FNMA
Investment securities
Fair value investments	88.6	53.6
Level 2 Inputs | FHLMC
Investment securities
Fair value investments	60.5	38.1
Level 2 Inputs | GNMA
Investment securities
Fair value investments	30.8	23.7
Level 2 Inputs | Total Agency
Investment securities
Fair value investments	179.9	115.4
Level 2 Inputs | Total mortgage-backed securities
Investment securities
Fair value investments	179.9	115.4
Level 2 Inputs | Vehicle receivables
Investment securities
Fair value investments	15.1	9.2
Level 2 Inputs | Credit card receivables
Investment securities
Fair value investments	14.0	8.9
Level 2 Inputs | Total other asset-backed securities
Investment securities
Fair value investments	29.1	18.1
Level 2 Inputs | Total mortgage and asset- backed securities
Investment securities
Fair value investments	209.0	133.5
Level 3 Inputs | FNMA
Investment securities
Fair value investments	0.0	0.0
Level 3 Inputs | FHLMC
Investment securities
Fair value investments	0.0	0.0
Level 3 Inputs | GNMA
Investment securities
Fair value investments	0.0	0.0
Level 3 Inputs | Total Agency
Investment securities
Fair value investments	0.0	0.0
Level 3 Inputs | Total mortgage-backed securities
Investment securities
Fair value investments	0.0	0.0
Level 3 Inputs | Vehicle receivables
Investment securities
Fair value investments	0.0	0.0
Level 3 Inputs | Credit card receivables
Investment securities
Fair value investments	0.0	0.0
Level 3 Inputs | Total other asset-backed securities
Investment securities
Fair value investments	0.0	0.0
Level 3 Inputs | Total mortgage and asset- backed securities
Investment securities
Fair value investments	$ 0.0	$ 0.0

X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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+ References

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