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Debt (Summary of Debt) (Details) - USD ($) $ in Millions		Oct. 27, 2016	Sep. 30, 2016	Dec. 31, 2015	Mar. 30, 2015
Debt Instrument [Line Items]
Balance outstanding			$ 85.2	$ 57.7
Balance outstanding			1,884.2	1,470.1
Balance outstanding			541.0	540.0
Restricted cash and cash equivalents pledged as collateral			232.8	167.4
Senior notes yield to maturity		2.90%
Revolving Secured Line of Credit [Member]
Debt Instrument [Line Items]
Balance outstanding			85.2	57.7
Amount available for borrowing	[1]		$ 224.8	$ 252.3
Interest rate			2.41%	2.30%
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			$ 1.1	$ 1.2
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			24.6	24.5
Restricted cash and cash equivalents pledged as collateral			$ 1.0	$ 0.9
Senior notes yield to maturity			2.52%	2.42%
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			$ 1.0	$ 1.0
Senior notes yield to maturity			0.00%	0.00%
Warehouse Facility VI [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 0.0	$ 14.7
Amount available for borrowing	[1]		75.0	60.3
Loans pledged as collateral			0.0	20.7
Restricted cash and cash equivalents pledged as collateral			$ 0.1	$ 0.9
Senior notes yield to maturity			0.00%	2.24%
Term ABS 2013-1 [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 0.0	$ 39.6
Loans pledged as collateral			0.0	144.5
Restricted cash and cash equivalents pledged as collateral			$ 0.0	$ 14.6
Senior notes yield to maturity			0.00%	1.56%
Term ABS 2013-2 [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 22.7	$ 163.5
Loans pledged as collateral			182.5	234.7
Restricted cash and cash equivalents pledged as collateral			$ 19.5	$ 21.4
Senior notes yield to maturity			2.26%	1.71%
Term ABS 2014-1 [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 173.3	$ 299.0
Loans pledged as collateral			336.1	366.4
Restricted cash and cash equivalents pledged as collateral			$ 32.5	$ 31.9
Senior notes yield to maturity			1.84%	1.72%
Term ABS 2014-2 [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 349.0	$ 349.0
Loans pledged as collateral			442.2	430.5
Restricted cash and cash equivalents pledged as collateral			$ 39.4	$ 37.7
Senior notes yield to maturity			2.05%	2.05%
Term ABS 2015-1 [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 300.6	$ 300.6
Loans pledged as collateral			382.5	372.4
Restricted cash and cash equivalents pledged as collateral			$ 32.6	$ 29.3
Senior notes yield to maturity			2.26%	2.26%
Term ABS 2015-2 [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 300.2	$ 300.2
Loans pledged as collateral			379.3	390.4
Restricted cash and cash equivalents pledged as collateral			$ 30.3	$ 27.7
Senior notes yield to maturity			2.63%	2.63%
Term ABS 2016-1 [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 385.0
Loans pledged as collateral			483.6
Restricted cash and cash equivalents pledged as collateral			$ 37.2
Senior notes yield to maturity			2.46%
Term ABS 2016-2 [Member]
Debt Instrument [Line Items]
Balance outstanding			$ 350.2
Loans pledged as collateral			514.1
Restricted cash and cash equivalents pledged as collateral			$ 37.3
Senior notes yield to maturity			2.83%
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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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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