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Fair Value Measurements - Summary of Non-Recurring Fair Value Measurement (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Net Asset (Liability) [Abstract] |  |  |  |
Property and equipment |  | $ 815,009,000 | $ 836,206,000 |
Goodwill |  | 3,821,609,000 | 3,753,493,000 | $ 3,652,309,000
Other intangible assets |  | 1,367,913,000 | 1,379,546,000 |
Total |  | 18,039,143,000 | 16,197,196,000 |
Asset Impairment Charges [Abstract] |  |  |  |
Goodwill | $ 25,000,000.0 | 25,000,000 | 0 |
Total |  | 88,676,000 | 89,787,000 | $ 0
Non-recurring |  |  |  |
Fair Value, Net Asset (Liability) [Abstract] |  |  |  |
Property and equipment |  | 12,870,000 |  |
Goodwill |  | 443,305,000 |  |
Other intangible assets |  | 12,562,000 | 14,753,000 |
Total |  | 468,737,000 |  |
Asset Impairment Charges [Abstract] |  |  |  |
Property and equipment |  | 29,168,000 |  |
Goodwill |  | 25,000,000 |  |
Other intangible assets |  | 34,508,000 | 89,787,000 |
Total |  | 88,676,000 |  |
Non-recurring | Level 1 |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Property and equipment |  | 0 |  |
Goodwill |  | 0 |  |
Other intangible assets |  | 0 | 0 |
Total assets at fair value |  | 0 |  |
Non-recurring | Level 2 |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Property and equipment |  | 12,870,000 |  |
Goodwill |  | 0 |  |
Other intangible assets |  | 0 | 0 |
Total assets at fair value |  | 12,870,000 |  |
Non-recurring | Level 3 |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Property and equipment |  | 0 |  |
Goodwill |  | 443,305,000 |  |
Other intangible assets |  | 12,562,000 | $ 14,753,000 |
Total assets at fair value |  | $ 455,867,000 |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 + Details
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