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Debt and Lease Commitments (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Debt Instrument [Line Items] |  |
Debt | $ 410.4 | $ 323.6
Less long-term debt due within one year | 7.5 | 7.2
Long-term debt | 402.9 | 316.4
Revolving Credit Agreement Borrowings |  |
Debt Instrument [Line Items] |  |
Debt | 190.0 | 80.0
Bank Credit Lines |  |
Debt Instrument [Line Items] |  |
Debt | 15.9 | 23.6
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Debt | 77.0 | 85.6
Term Notes With Insurance Companies |  |
Debt Instrument [Line Items] |  |
Debt | 122.7 | 125.5
Canadian Term Notes With Insurance Companies |  |
Debt Instrument [Line Items] |  |
Debt | $ 4.8 | $ 8.9

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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