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Reportable Business Segments, Reconciliation of Segment Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Segment operating income | $ 377.9 | $ 326.3 | $ 1,028.2 | $ 866.1
Interest expense | (24.6) | (18.1) | (67.3) | (54.2)
Other income, net | 5.1 | 2.3 | 12.9 | 5.0
Stock-based compensation expense | (12.6) | (12.2) | (37.1) | (35.5)
Acquisition-related expenses |  | (6.3) | (4.0) | (36.6)
Other operating expenses | (12.1) | (11.0) | (35.5) | (32.6)
Income before income taxes | 358.4 | 310.5 | 973.8 | 816.9
Operating Segment |  |  |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Segment operating income | $ 402.6 | $ 355.8 | $ 1,104.8 | $ 970.8

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