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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value measured on a recurring basis |  |
Assets |  |
Deferred compensation plan assets | $ 89.5 | $ 99.1
Foreign currency forward contracts | 0.1 | 0.0
Total assets measured at fair value | 89.6 | 99.1
Liabilities |  |
Foreign currency forward contracts | 0.1 | 0.1
Total liabilities measured at fair value | 0.1 | 0.1
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value measured on a recurring basis |  |
Assets |  |
Deferred compensation plan assets | 89.5 | 99.1
Foreign currency forward contracts | 0.0 | 0.0
Total assets measured at fair value | 89.5 | 99.1
Liabilities |  |
Foreign currency forward contracts | 0.0 | 0.0
Total liabilities measured at fair value | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Estimate of fair value measurement |  |
Liabilities |  |
Euro-denominated notes | 1,052.9 | 939.9
Significant Other Observable Inputs (Level 2) | Carrying value |  |
Liabilities |  |
Euro-denominated notes | 1,024.6 | 897.8
Significant Other Observable Inputs (Level 2) | Fair value measured on a recurring basis |  |
Assets |  |
Deferred compensation plan assets | 0.0 | 0.0
Foreign currency forward contracts | 0.1 | 0.0
Total assets measured at fair value | 0.1 | 0.0
Liabilities |  |
Foreign currency forward contracts | 0.1 | 0.1
Total liabilities measured at fair value | 0.1 | 0.1
Significant Unobservable Inputs (Level 3) | Fair value measured on a recurring basis |  |
Assets |  |
Deferred compensation plan assets | 0.0 | 0.0
Foreign currency forward contracts | 0.0 | 0.0
Total assets measured at fair value | 0.0 | 0.0
Liabilities |  |
Foreign currency forward contracts | 0.0 | 0.0
Total liabilities measured at fair value | $ 0.0 | $ 0.0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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