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Debt (Schedule of Additional Information Related to Debt Instruments) (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt | $ 2,880.2 |  | $ 2,514.1 |  |
Restricted cash and cash equivalents | 368.5 | $ 316.7 | 255.6 | $ 224.7 |
TermAssetBackedSecuredFinancingsTwoThousandSeventeenThree [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt | 350.0 |  | 350.0 |  |
Loans pledged as collateral | 473.6 |  | 482.6 |  |
Restricted cash and cash equivalents | $ 38.4 |  | $ 29.6 |  |
Senior notes yield to maturity | 2.88% |  | 0.00% |  |
Revolving Secured Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum outstanding balance | $ 177.5 | 188.0 |  |  |
Average outstanding balance | 39.1 | 62.4 |  |  |
Warehouse Facility II [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt | 0.0 |  | $ 0.0 |  |
Maximum outstanding balance | 201.0 | 200.1 |  |  |
Average outstanding balance | 4.5 | 4.5 |  |  |
Loans pledged as collateral | 0.0 |  | 0.0 |  |
Restricted cash and cash equivalents | $ 1.4 |  | $ 1.0 |  |
Senior notes yield to maturity | 0.00% |  | 0.00% |  |
Warehouse Facility IV [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt | $ 0.0 |  | $ 0.0 |  |
Maximum outstanding balance | 0.0 | 12.0 |  |  |
Average outstanding balance | 0.0 | 12.0 |  |  |
Loans pledged as collateral | 0.0 |  | 0.0 |  |
Restricted cash and cash equivalents | $ 1.2 |  | $ 1.0 |  |
Senior notes yield to maturity | 0.00% |  | 0.00% |  |
Warehouse Facility V [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt | $ 0.0 |  | $ 0.0 |  |
Maximum outstanding balance | 99.0 | 100.0 |  |  |
Average outstanding balance | 2.2 | 2.2 |  |  |
Loans pledged as collateral | 0.0 |  | 0.0 |  |
Restricted cash and cash equivalents | $ 1.2 |  | $ 1.0 |  |
Senior notes yield to maturity | 0.00% |  | 0.00% |  |
Warehouse Facility VI [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt | $ 0.0 |  | $ 0.0 |  |
Maximum outstanding balance | 75.0 | 49.9 |  |  |
Average outstanding balance | 1.7 | 1.1 |  |  |
Loans pledged as collateral | 0.0 |  |  |  |
Restricted cash and cash equivalents | $ 0.1 |  | $ 0.0 |  |
Senior notes yield to maturity | 0.00% |  | 0.00% |  |
2023 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes yield to maturity | 7.375% |  | 7.375% |  | 7.50%
Warehouse Facility VII [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt | $ 0.0 |  |  |  |
Maximum outstanding balance | 125.0 | 0.0 |  |  |
Average outstanding balance | 2.8 | $ 0.0 |  |  |
Loans pledged as collateral | 0.0 |  |  |  |
Restricted cash and cash equivalents | $ 1.1 |  | $ 1.0 |  |
Senior notes yield to maturity | 0.00% |  | 0.00% |  |
TermAssetBackedSecuredFinancingsTwoThousandEighteenOne [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured Debt | $ 500.0 |  |  |  |
Loans pledged as collateral | 629.5 |  |  |  |
Restricted cash and cash equivalents | $ 50.1 |  |  |  |
Senior notes yield to maturity | 3.24% |  |  |  |

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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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