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Commercial Commitments (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Guarantor Obligations [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value |  | $ 0.7 | $ 0.9
Total commercial commitments | [1] | 10.9 | 11.5
Lease payment guarantees [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Total commercial commitments |  | 1.5 | 2.0
Standby letters of credit [Member] |  |  |
Guarantor Obligations [Line Items] |  |  |
Total commercial commitments |  | $ 9.4 | $ 9.5
[1] | (1) The carrying value of liabilities on the balance sheet for commercial commitments was $0.7 million at March 31, 2019 and $0.9 million at December 31, 2018. The expirations of these commitments range from 2019 to 2023. We are not aware of any event that would require us to satisfy any of our commitments.

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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