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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020
Goodwill [Line Items] |  |  |  |  |  |  |
Ownership percentage in joint venture |  | 50.00% |  |  | 50.00% |  |
Goodwill impairment charge | $ 0.0 |  | $ 0.0 |  |  | $ 0.0 | $ 20.0
Equity Method Investment, Ownership Percentage |  |  |  | 50.00% |  |  |
Minimum |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Weighted-Average Useful Life |  |  |  |  |  | 5 years |
Maximum |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Weighted-Average Useful Life |  |  |  |  |  | 50 years |
Goodwill Impairment Loss |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  | $ 20.0 |  |  |
Net Loss Attributable to Noncontrolling Interests |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  | $ 10.0 |  |  |

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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