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Debt - Long-term debt (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2018 | Dec. 31, 2017 | Apr. 02, 2017
Financing Arrangements |  |  |
Less current maturities | $ (22.5) | $ (22.5) |
Total long-term debt | 424.1 | $ 474.6 |
Principal payments during each of the next five years and thereafter |  |  |
Letters of credit outstanding | $ 25.7 |  | $ 25.6
5.05% Senior notes due 2020 |  |  |
Financing Arrangements |  |  |
Interest rate (as a percent) | 5.05% |  |
Letters of credit |  |  |
Financing Arrangements |  |  |
Term of letters of credit from the date of issuance | 1 year |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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