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Reportable Business Segments, Reconciliation of Segment Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reconciliation of segment operating income to consolidated income before income taxes |  |
Segment operating income | $ 376.9 | $ 314.1
Interest expense | (24.5) | (19.3)
Other income, net | 2.3 | 3.6
Stock-based compensation expense | (12.7) | (12.1)
Other operating expenses | (12.8) | (11.4)
Income before income taxes | 354.7 | 298.4
Operating Segment |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |
Segment operating income | $ 402.4 | $ 337.6

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