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Fair Value of Financial Instruments (Acquisition-Related Contingent Consideration and Other Liabilities) (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Acquisition-related contingent consideration liabilities, net increase (decrease), measurement period adjustments |  |  | $ 100,000 |  |
All Acquisitions [Member] |  |  |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low | $ 17,000,000 |  | 17,000,000 |  |
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high | $ 189,000,000 |  | $ 189,000,000 |  |
Discount Rate | Minimum |  |  |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Acquisition-related contingent consideration liabilities, measurement input, discount rate | 0.120 |  | 0.120 |  |
Discount Rate | Maximum |  |  |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Acquisition-related contingent consideration liabilities, measurement input, discount rate | 0.235 |  | 0.235 |  |
Discount Rate | Weighted Average |  |  |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Acquisition-related contingent consideration liabilities, measurement input, discount rate | 0.130 |  | 0.130 |  |
Earn-Out Liabilities |  |  |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Acquisition-related contingent consideration liabilities, estimated fair value | $ 119,800,000 |  | $ 119,800,000 |  | $ 135,200,000
Acquisition-related contingent consideration liabilities, additions from new business combinations | 40,100,000 | $ 7,200,000 | 40,100,000 | $ 7,200,000 |
Acquisition-related contingent consideration liabilities, net increase (decrease), measurement period adjustments | 0 |  | 0 | 1,100,000 |
Acquisition-related contingent consideration liabilities, net increase (decrease), fair value adjustments, expense (income) | (8,900,000) |  | (9,300,000) | 1,700,000 |
Acquisition-related contingent consideration liabilities, payments | 46,200,000 | $ 50,400,000 | 46,200,000 | $ 50,400,000 |
Earn-Out Liabilities | Other Current Liabilities |  |  |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Acquisition-related contingent consideration liabilities, estimated fair value | 58,900,000 |  | 58,900,000 |  | 48,100,000
Earn-Out Liabilities | Mandatorily Redeemable Stock |  |  |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |  |  |
Acquisition-related contingent consideration liabilities, estimated fair value | 16,800,000 |  | 16,800,000 |  | $ 18,800,000
Acquisition-related contingent consideration liabilities, payments | $ 2,100,000 |  | $ 2,100,000 |  |

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition Value of input used to measure contingent consideration liability from business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value of obligations measured on a recurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting 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 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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