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Fair Value Measurements (Details 2) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Additions | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Changes in fair value | 21.2 | 10.6 | 31.2 | 12.9
Payments | 0.0 | (3.2) | (6.7) | (3.2)
Fair Value, Measurements, Recurring |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |
Fair value, beginning of period | 470.9 | 508.3 | 467.6 | 506.0
Fair value, end of period | $ 492.1 | $ 515.7 | $ 492.1 | $ 515.7

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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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