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Acquisitions - Aggregate Disclosure Related to Business Acquisitions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Cash paid, net of cash acquired | $ 296.6 | $ 57.7 | $ 0.0
Contingent acquisition consideration | 44.6 | 7.5 |
Excess purchase price allocated to goodwill | 3,279.9 | $ 2,956.1 | $ 2,888.4
Aggregate total 2018 |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration | 46.2 |  |
Cash paid, net of cash acquired | 34.1 |  |
Contingent acquisition consideration | 9.0 |  |
Allocation of purchase price to intangible assets, net | $ 41.6 |  |
Weighted average useful life of acquired intangible assets | 9 years 4 months 18 days |  |
Excess purchase price allocated to goodwill | $ 10.8 |  |
Aggregate total 2017 |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration | 66.0 |  |
Cash paid, net of cash acquired | 57.7 |  |
Contingent acquisition consideration | 7.5 |  |
Allocation of purchase price to intangible assets, net | 56.4 |  |
Weighted average useful life of acquired intangible assets |  | 8 years 3 months 18 days |
Excess purchase price allocated to goodwill | $ 12.8 |  |
Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Discount rate | 9.00% |  |
Royalty rate | 1.00% |  |
Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Discount rate | 20.00% |  |
Royalty rate | 16.00% |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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