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Debt Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | $ (20.5) | $ (20.9)
Unamortized Discount |  | (1.1) | (1.3)
Debt Instrument, Carrying Amount |  | 3,820.9 | 3,070.8
Debt Instrument, Principal Outstanding |  | 3,842.5 | 3,093.0
Other Assets [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs | [1] | (2.9) | (2.8)
Revolving Secured Line Of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs | [2] | 0.0 | 0.0
Unamortized Discount | [2] | 0.0 | 0.0
Debt Instrument, Carrying Amount | [2] | 171.9 | 13.9
Debt Instrument, Principal Outstanding | [2] | 171.9 | 13.9
Secured financings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs | [1] | (16.0) | (15.0)
Unamortized Discount | [1] | 0.0 | 0.0
Debt Instrument, Carrying Amount | [1] | 3,092.7 | 2,514.1
Debt Instrument, Principal Outstanding | [1] | 3,108.7 | 2,529.1
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | (4.5) | (5.9)
Unamortized Discount |  | (1.1) | (1.3)
Debt Instrument, Carrying Amount |  | 544.4 | 542.8
Debt Instrument, Principal Outstanding |  | 550.0 | $ 550.0
Mortgage [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | 0.0 |
Unamortized Discount |  | 0.0 |
Debt Instrument, Carrying Amount |  | 11.9 |
Debt Instrument, Principal Outstanding |  | $ 11.9 |
[1] | Warehouse facilities and Term ABS financings.
[2] | Excludes deferred debt issuance costs of $2.9 million and $2.8 million as of December 31, 2018 and December 31, 2017, respectively, which are included in other assets.

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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