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Reportable Business Segments, Reconciliation of Segment Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Reconciliation of segment operating income to consolidated income before income taxes |  |
Segment operating income | $ 314.1 | $ 239.4
Interest expense | (19.3) | (18.1)
Other income, net | 3.6 | 1.0
Stock-based compensation expense | (12.1) | (11.6)
Acquisition-related expenses |  | (30.3)
Other operating expenses | (11.4) | (11.0)
Income before income taxes | 298.4 | 222.3
Operating Segment |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |
Segment operating income | $ 337.6 | $ 292.3

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