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Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair value assets and liabilities measured on recurring basis |  |  |
Cash equivalents |  | $ 201.6 | $ 440.8
Contingent acquisition obligations | [1] | 147.0 | 205.4
Contingent acquisition obligation, total change |  | (58.4) |
Contingent acquisition obligation, payments |  | (105.3) |
Contingent acquisition obligation, additions |  | 40.8 |
Level 1 |  |  |
Fair value assets and liabilities measured on recurring basis |  |  |
Cash equivalents |  | 201.6 | 440.8
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
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
Contingent acquisition obligations | [1] | $ 147.0 | $ 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 $58.4 from December 31, 2016 to December 31, 2017 is primarily due to payments of $105.3, partially offset by acquisitions and exercised put options of $40.8. 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 Amount of increase in the value of a contingent consideration liability, including, but not limited to, acquisitions and exercised put options. + References No definition available. + Details
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- Definition Amount of decrease in the value of a contingent consideration liability due to payments to acquirees. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + 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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