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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Restructuring and Related Activities [Abstract] |  |  |  |
Restructuring and acquisition charges | $ 11.1 | $ (5.4) | $ 10.4 | $ (9.9)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | (13.6) | 0.7 | (14.8) | (2.1)
Restructuring reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  |  | 21.3 | 31.0
Restructuring charges |  |  | 4.4 | 12.0
Payments made |  |  | (12.4) | (21.4)
Restructuring reserve, ending balance | 13.3 | 21.6 | 13.3 | 21.6
Severance [Member] |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  |  | 14.2 | 19.7
Restructuring charges |  |  | 3.7 | 6.4
Payments made |  |  | (10.0) | (15.3)
Restructuring reserve, ending balance | 7.9 | 10.8 | 7.9 | 10.8
Lease Exit [Member] |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  |  | 5.7 | 5.5
Restructuring charges |  |  | 0.2 | 1.3
Payments made |  |  | (0.5) | (0.4)
Restructuring reserve, ending balance | 5.4 | 6.4 | 5.4 | 6.4
Other Acquisition Costs [Member] |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  |  | 1.4 | 5.8
Restructuring charges |  |  | 0.5 | 4.3
Payments made |  |  | (1.9) | (5.7)
Restructuring reserve, ending balance | $ 0.0 | $ 4.4 | $ 0.0 | $ 4.4

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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 Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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