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Impairment, Restructuring and Other Exit Costs - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Restructuring [Line Items] |  |
Severance | $ 6.6 | $ 63.9
Fair value of other impaired assets |  | 25.0
Restructuring Costs | 8.0 | 240.0
Level 3 | Investments |  |
Restructuring [Line Items] |  |
Carrying value of investments |  | 95.0
Customer relationships |  |
Restructuring [Line Items] |  |
Impairment loss on intangible assets | 27.0 | 34.0
Customer relationships | Other assets | Rationalization of Resources, Investments, Real Estate and Overhead Across Various Geographies |  |
Restructuring [Line Items] |  |
Impairment loss on intangible assets | $ 31.0 |
Customer relationships | Level 3 | Measurement Input, Weighted Average Long-term Revenue Growth Rate |  |
Restructuring [Line Items] |  |
Measurement input | 2.40% |
Customer relationships | Level 3 | Measurement Input, Weighted Average Cost of Capital |  |
Restructuring [Line Items] |  |
Measurement input | 12.00% |
Customer relationships | Level 3 | Measurement Input, Customer Attrition Factor |  |
Restructuring [Line Items] |  |
Measurement input | 10.00% |
Customer relationships | Minimum | Level 3 | Measurement Input, Long-term Revenue Growth Rate |  |
Restructuring [Line Items] |  |
Measurement input | 2.00% |
Customer relationships | Maximum | Level 3 | Measurement Input, Long-term Revenue Growth Rate |  |
Restructuring [Line Items] |  |
Measurement input | 5.50% |
AMECO |  |
Restructuring [Line Items] |  |
Restructuring Costs | $ 8.0 | $ 240.0

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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