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Restructuring and other - Restructuring and Other Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other | $ 27.8 | $ 7.8 | $ 1.1 | $ 9.2 | $ 36.3 | $ 13.8 | $ 4.2 | $ 2.7 | $ 45.9 | $ 57.0 | $ 21.9
NYX |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 15.1 |  |
Employee severance |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 9.8 | 36.2 | 16.9
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 21.1 | 2.5 | 1.5
Management restructuring and related costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | 1.4 | 5.9 | 0.0
Restructuring, integration and other |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  | $ 13.6 | $ 12.4 | $ 3.5

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