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Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Level 1 |  |  |
Fair value assets and liabilities measured on recurring basis |  |  |
Cash equivalents |  | $ 153.2 | $ 440.8
Short-term marketable securities |  | 0.1 | 3.0
Long-term investments |  | 0.4 | 0.4
Fair Value of Total Assets, Recurring |  | $ 153.7 | $ 444.2
Fair value of assets measured on a recurring basis percentage of total assets |  | 1.30% | 3.60%
Contingent acquisition obligations | [1] | $ 0.0 | $ 0.0
Level 2 |  |  |
Fair value assets and liabilities measured on recurring basis |  |  |
Cash equivalents |  | 0.0 | 0.0
Short-term marketable securities |  | 0.0 | 0.0
Long-term investments |  | 0.0 | 0.0
Fair Value of Total Assets, Recurring |  | $ 0.0 | $ 0.0
Fair value of assets measured on a recurring basis percentage of total assets |  | 0.00% | 0.00%
Contingent acquisition obligations | [1] | $ 0.0 | $ 0.0
Level 3 |  |  |
Fair value assets and liabilities measured on recurring basis |  |  |
Cash equivalents |  | 0.0 | 0.0
Short-term marketable securities |  | 0.0 | 0.0
Long-term investments |  | 0.0 | 0.0
Fair Value of Total Assets, Recurring |  | $ 0.0 | $ 0.0
Fair value of assets measured on a recurring basis percentage of total assets |  | 0.00% | 0.00%
Contingent acquisition obligations | [1] | $ 164.2 | $ 205.4
Fair Value, Total [Member] |  |  |
Fair value assets and liabilities measured on recurring basis |  |  |
Cash equivalents |  | 153.2 | 440.8
Short-term marketable securities |  | 0.1 | 3.0
Long-term investments |  | 0.4 | 0.4
Fair Value of Total Assets, Recurring |  | $ 153.7 | $ 444.2
Fair value of assets measured on a recurring basis percentage of total assets |  | 1.30% | 3.60%
Contingent acquisition obligations | [1] | $ 164.2 | $ 205.4
[1] | Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The decrease in this balance of $41.2 from December 31, 2016 to September 30, 2017 is primarily due to payments of $91.4, partially offset by acquisitions and exercised options of $38.2. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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