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Acquisitions Cash Paid for Acquisitions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Paid for Acquisitions [Abstract] |  |  |
Cost of investment: current-year acquisitions 1 | $ 0.6 | $ 2,323.4 | $ 36.8
Cost of investment: prior-year acquisitions | 15.8 | 33.9 | 54.6
Less: net cash acquired | 0.0 | (13.8) | (7.1)
Total cost of investment | 16.4 | 2,343.5 | 84.3
Operating payments | 9.3 | 19.4 | 47.1
Total cash paid for acquisitions | 25.7 | 2,362.9 | 131.4
Acquisitions, net of cash acquired | 0.6 | 2,309.8 | 30.6
Payments for previous acquisition, financing cash flows | $ 15.8 | $ 33.7 | $ 53.7

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- Definition Cash Paid for Acquisitions [Abstract] + References No definition available. + Details
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- Definition The cash outflow associated with the current year acquisition of business during the period. The cash portion only of the acquisition price. + References No definition available. + Details
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- Definition The cash outflow associated with the prior year acquisition of businesses during the period. The cash portion only of the acquisition price. + References No definition available. + Details
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- Definition Total Cash Payments to Acquire Businesses including Operating Expenses + References No definition available. + Details
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- Definition The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Cash outflow representing an adjustment to the purchase price of a previous acquisition. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + 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 (b)(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 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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