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Properties - Components of Properties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Total properties | $ 806.0 | $ 800.2 |
Pretax gain | 0.0 | 7.3 | $ 0.0
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total properties | 2.3 | 2.3 |
Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total properties | 63.5 | 63.5 |
Machinery and office equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total properties | 534.3 | 530.0 |
Internal-use software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total properties | 171.0 | 164.7 |
Rental equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total properties | $ 34.9 | 39.7 |
United Kingdom | Building and land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net proceeds received |  | 19.2 |
Pretax gain |  | $ 7.3 |

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- Definition Gain (Loss) on Disposition of Property Plant Equipment, Not Part of Normal Course of Business + References No definition available. + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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