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Debt (Summary of Debt) (Details) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016	Mar. 30, 2015
Debt Instrument [Line Items]
Balance outstanding		$ 134.1	$ 0.0
Balance outstanding		2,229.5	2,062.4
Balance outstanding		541.7	541.3
Restricted cash and cash equivalents pledged as collateral		316.7	224.7
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Balance outstanding		134.1	0.0
Amount available for borrowing	[1]	$ 175.9	$ 310.0
Interest rate		2.86%	0.00%
Warehouse Facility II [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 0.0	$ 0.0
Amount available for borrowing	[1]	400.0	400.0
Loans pledged as collateral		0.0	0.0
Restricted cash and cash equivalents pledged as collateral		$ 1.6	$ 1.5
Senior notes yield to maturity		0.00%	0.00%
Warehouse Facility IV [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 12.0	$ 12.0
Amount available for borrowing	[1]	63.0	63.0
Loans pledged as collateral		20.1	23.0
Restricted cash and cash equivalents pledged as collateral		$ 1.1	$ 0.9
Senior notes yield to maturity		2.98%	2.77%
Warehouse Facility V [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 0.0
Amount available for borrowing	[1]	100.0	$ 100.0
Loans pledged as collateral		0.0
Restricted cash and cash equivalents pledged as collateral		$ 1.2	$ 1.0
Senior notes yield to maturity		0.00%	0.00%
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 0.0
Amount available for borrowing	[1]	75.0	$ 75.0
Loans pledged as collateral		0.0
Restricted cash and cash equivalents pledged as collateral		$ 0.2	$ 0.1
Senior notes yield to maturity		0.00%	0.00%
Term ABS 2014-1 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 45.5	$ 106.5
Loans pledged as collateral		268.3	307.2
Restricted cash and cash equivalents pledged as collateral		$ 33.7	$ 28.3
Senior notes yield to maturity		2.29%	2.02%
Term ABS 2014-2 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 191.4	$ 267.6
Loans pledged as collateral		369.9	413.9
Restricted cash and cash equivalents pledged as collateral		$ 41.7	$ 34.9
Senior notes yield to maturity		2.19%	2.10%
Term ABS 2015-1 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 255.8	$ 300.6
Loans pledged as collateral		343.6	374.5
Restricted cash and cash equivalents pledged as collateral		$ 35.8	$ 29.6
Senior notes yield to maturity		2.30%	2.26%
Term ABS 2015-2 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 300.2	$ 300.2
Loans pledged as collateral		367.0	372.6
Restricted cash and cash equivalents pledged as collateral		$ 36.2	$ 28.1
Senior notes yield to maturity		2.63%	2.63%
Term ABS 2016-1 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 385.0	$ 385.0
Loans pledged as collateral		465.6	474.0
Restricted cash and cash equivalents pledged as collateral		$ 45.2	$ 34.8
Senior notes yield to maturity		2.86%	2.65%
Term ABS 2016-2 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 350.2	$ 350.2
Loans pledged as collateral		443.4	490.7
Restricted cash and cash equivalents pledged as collateral		$ 41.8	$ 34.4
Senior notes yield to maturity		2.83%	2.83%
Term ABS 2016-3 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 350.0	$ 350.0
Loans pledged as collateral		480.0	489.6
Restricted cash and cash equivalents pledged as collateral		$ 39.7	$ 30.6
Senior notes yield to maturity		2.53%	2.53%
Term ABS 2017-1 [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 350.0
Loans pledged as collateral		476.5
Restricted cash and cash equivalents pledged as collateral		$ 37.7
Senior notes yield to maturity		2.78%
2021 Senior Notes [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 300.0	$ 300.0
Senior notes yield to maturity		6.125%	6.125%
2023 Senior Notes [Member]
Debt Instrument [Line Items]
Balance outstanding		$ 250.0	$ 250.0
Senior notes yield to maturity		7.375%	7.375%	7.50%
[1] Availability may be limited by the amount of assets pledged as collateral.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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