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Acquisitions Cash Paid for Acquisitions (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Business Combinations [Abstract] |  |  |
Cost of investment: current-year acquisitions |  | $ 36.5 | $ 0.0
Cost of investment: prior-year acquisition |  | 29.7 | 27.8
Less: net cash acquired |  | (2.7) | 0.0
Total cost of investment |  | 63.5 | 27.8
Operating expense | [1] | 17.4 | 17.6
Total cash paid for acquisitions | [2] | 80.9 | 45.4
Payments to acquire businesses, investing activity |  | 34.3 | 0.0
Payments for previous acquisition, financing activity |  | $ 29.2 | $ 27.8
[1] | Represents cash payments made that were either in excess of the initial value of contingent payments or contingent upon the future employment of the former owners of the acquired companies and are recorded in the operating section of the unaudited Consolidated Statements of Cash Flows.
[2] | $34.3 for the six months ended June 30, 2016 is classified under the investing section of the unaudited Consolidated Statements of Cash Flows, as acquisitions, net of cash acquired. This amount relates to initial payments for new transactions. $29.2 of cash paid for six months ended June 30, 2016 is classified under the financing section of the unaudited Consolidated Statements of Cash Flows as acquisition-related payments. This amount relates to deferred payments and increases in our ownership interest for prior acquisitions.

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- Definition Payments to Acquire Businesses, Gross for Current Year Acquisitions + References No definition available. + Details
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- Definition Payments to Acquire Businesses, Gross for Prior Year Acquisitions + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=65885119&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition Cash outflow representing an adjustment to the purchase price of a previous acquisition. + References No definition available. + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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