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Reportable Business Segments, Reconciliation of Segment Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Segment operating income | $ 408.2 | $ 336.2 | $ 785.1 | $ 650.3
Interest expense | (26.0) | (23.4) | (50.5) | (42.7)
Other income, net | 0.1 | 4.4 | 2.4 | 7.9
Stock-based compensation expense | (13.3) | (12.3) | (26.0) | (24.4)
Acquisition-related expenses |  | (4.0) |  | (4.0)
Other operating expenses | (12.9) | (11.9) | (25.8) | (23.4)
Income before income taxes | 382.3 | 317.2 | 737.0 | 615.5
Operating Segment |  |  |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |
Segment operating income | $ 434.4 | $ 364.4 | $ 836.9 | $ 702.1

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