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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
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information |  |
Segment operating income | $ 376.2 | $ 376.9
Interest expense | (29.7) | (24.5)
Other income, net | 3.0 | 2.3
Stock-based compensation expense | (14.4) | (12.7)
Acquisition-related expenses | (16.5) |
Other operating expenses | (13.4) | (12.8)
Income before income taxes | 349.5 | 354.7
Operating Segment |  |
Segment Reporting Information |  |
Segment operating income | $ 420.5 | $ 402.4

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