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Financial Instruments - Fair Values of Financial Instruments Not Approximating Carrying Values in Financial Statements (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, notes payable and current maturities of long-term debt | $ 1,208.4 | $ 1,010.2
Carrying Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Finance receivables - net | 1,524.4 | 1,407.0
Contract receivables - net | 410.2 | 374.8
Long-term debt, notes payable and current maturities of long-term debt | 1,208.4 | 1,010.2
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Finance receivables - net | 1,767.1 | 1,631.2
Contract receivables - net | 448.4 | 409.7
Long-term debt, notes payable and current maturities of long-term debt | $ 1,264.7 | $ 1,076.7

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- Definition Contract receivables - net. + References No definition available. + Details
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- Definition Notes and loans receivable net. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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Period Type: | instant

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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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