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Restructuring and other (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other | $ (171.0) | $ 338.7 | $ 33.5 | $ 52.2 | $ 27.8 | $ 7.8 | $ 1.1 | $ 9.2 | $ 253.4 | $ 45.9 | $ 57.0
Employee severance |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 37.2 | 9.8 | 36.2
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 7.6 | 21.1 | 2.5
Acquisition-related costs | NYX |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 7.7 | 15.1 |
Contingent acquisition consideration |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 28.7 | 0.0 | 0.0
Legal and related |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 152.5 | 0.0 | 0.0
Restructuring, integration and other |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | $ 27.4 | $ 15.0 | $ 18.3

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