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Other Noncurrent Assets (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |  |
Identifiable intangible assets (net of accumulated amortization of $315.5 million, $277.5 million, and $286.9 million, respectively) | $ 487,769,000 | $ 519,861,000 | $ 487,769,000 | $ 519,861,000 | $ 518,190,000
Deferred income taxes | 579,950,000 | 60,850,000 | 579,950,000 | 60,850,000 | 72,682,000
Identifiable intangible assets, accumulated amortization | 315,500,000 | 277,500,000 | 315,500,000 | 277,500,000 | $ 286,900,000
Impairment of intangible assets | 0 | 0 | 0 | 0 |
Discrete tax benefit | $ 465,300,000 | $ (1,700,000) | $ 445,800,000 | $ (11,400,000) |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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