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Reportable Business Segments, Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information |  |  |  |
Operating income | $ 399.5 | $ 408.2 | $ 775.7 | $ 785.1
Interest expense | (30.0) | (26.0) | (59.7) | (50.5)
Other income, net | 0.1 | 0.1 | 3.1 | 2.4
Stock-based compensation expense | (15.4) | (13.3) | (29.8) | (26.0)
Acquisition-related expenses | (8.9) | 0.0 | (25.4) | 0.0
Other operating expenses | (13.3) | (12.9) | (26.7) | (25.8)
Income before income taxes | 369.6 | 382.3 | 719.1 | 737.0
Operating Segment |  |  |  |
Segment Reporting Information |  |  |  |
Operating income | $ 437.1 | $ 434.4 | $ 857.6 | $ 836.9

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