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Fair Value of Financial Instruments (Acquisition-Related Contingent Consideration) (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low | $ 48.0 |  |
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high | 179.0 |  |
Acquisition-related contingent consideration liabilities, net increase (decrease), measurement period adjustments | $ 6.1 | $ (0.1) |
Discount Rate [Member] | Minimum [Member] |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |
Acquisition-related contingent consideration liabilities, measurement input, discount rate | 0.120 |  |
Discount Rate [Member] | Maximum [Member] |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |
Acquisition-related contingent consideration liabilities, measurement input, discount rate | 0.200 |  |
Discount Rate [Member] | Weighted Average [Member] |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |
Acquisition-related contingent consideration liabilities, measurement input, discount rate | 0.131 |  |
Earn-Out Liabilities [Member] |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |
Acquisition-related contingent consideration liabilities, estimated fair value | $ 135.2 | 173.2 |
Acquisition-related contingent consideration liabilities, additions from new business combinations | 7.2 | 45.2 | $ 1.5
Acquisition-related contingent consideration liabilities, net increase (decrease), measurement period adjustments | 2.1 | (6.1) | 5.0
Acquisition-related contingent consideration liabilities, net increase (decrease), fair value adjustments, expense (income) | 3.1 | 51.0 | 17.5
Acquisition-related contingent consideration liabilities, payments | 50.4 | 35.0 | $ 23.1
Earn-Out Liabilities [Member] | Mandatorily Redeemable Stock [Member] |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |
Acquisition-related contingent consideration liabilities, net increase (decrease), fair value adjustments, expense (income) | 1.0 |  |
Earn-Out Liabilities [Member] | Other Current Liabilities [Member] |  |  |
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items] |  |  |
Acquisition-related contingent consideration liabilities, estimated fair value | $ 48.1 | $ 54.1 |

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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 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 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 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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