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Debt - Summary of Debt Instruments Narrative (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 20, 2017 | Oct. 24, 2014 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Unused facility fee, as percentage of unused portion |  |  | 0.30% |  |
Deferred finance costs |  |  | $ 4,800,000 |  |
Securitization Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amended securitization facility |  |  | $ 950,000,000 |  |
Unused facility fee, as percentage of unused portion |  |  | 0.40% | 0.40% |
Program fee |  |  | one month LIBOR |  |
Revolving line of credit A Facility—domestic |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 3.38% |  |
Revolving line of credit B Facility—foreign |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 2.00% |  |
Revolving line of credit B Facility—swing line |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 1.97% |  |
Term Loan A |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility initial borrowing, unamortized debt discount |  |  | $ 5,600,000 |  |
Term Loan B |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility initial borrowing, unamortized debt discount |  |  | $ 700,000 |  |
Effective interest rate |  |  | 3.88% |  |
Commercial Paper | Securitization Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 0.80% |  | 0.86%
Program fee rate |  |  | 1.9139% |  | 1.55%
Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Additional borrowing capacity |  | $ 750,000,000 |  |  |
Secured Debt | Term A Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amended securitization facility |  |  | $ 1,285,000,000.000 |  |
Secured Debt | Term Loan A |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amended securitization facility |  |  | 2,690,000,000.00 |  |
Secured Debt | Term Loan B |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amended securitization facility |  |  | 350,000,000.0 |  |
Secured Debt | Revolving A Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amended securitization facility |  |  | 800,000,000 |  |
Secured Debt | Revolving B Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amended securitization facility |  |  | 450,000,000 |  |
Secured Debt | Revolving C Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amended securitization facility |  |  | $ 35,000,000 |  |
London Interbank Offered Rate (LIBOR) | Commercial Paper | Securitization Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 0.90% |  |
Eurodollar | Secured Debt | Term Loan B |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |
Base Rate | Secured Debt | Term Loan B |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |
Blended Rate Of LIBOR And Commercial Paper Rates Based On Weighted Average Advance | Commercial Paper | Securitization Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 0.86% |  |
Minimum | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused facility fee, as percentage of unused portion |  |  | 0.20% |  |
Minimum | Federal Funds Rate Plus | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |
Maximum | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused facility fee, as percentage of unused portion |  |  | 0.40% |  |
Maximum | Eurodollar | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |

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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + Details
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