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Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | [1] | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Contribution margin |  |  |  |  |  |  |  |  |  |  |
Total Contribution margin |  |  |  |  |  |  |  |  | $ 2,608.5 | $ 2,324.9 | $ 2,361.2
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 1,955.2 | 1,758.6 | 1,966.9
Other operating income |  |  |  |  |  |  |  |  | (29.8) | (50.8) | (63.8)
Interest expense |  |  |  |  |  |  |  |  | 181.0 | 160.8 | 99.3
Interest income |  |  |  |  |  |  |  |  | 19.4 | 14.5 | 5.9
Other expense (income), net |  |  |  |  |  |  |  |  | 57.3 | (0.4) |
Income before income taxes |  |  |  |  |  |  |  |  | 464.2 | 471.2 | 364.7
Income taxes |  |  |  |  |  |  |  |  | 167.6 | 257.3 | 104.7
Net income | $ 48.9 | $ 71.2 | $ 94.4 | $ 82.1 | $ (63.4) | $ 54.5 | $ 137.6 | $ 85.2 | 296.6 | 213.9 | 260.0
Primary Reporting Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Contribution margin |  |  |  |  |  |  |  |  |  |  |
Total Contribution margin |  |  |  |  |  |  |  |  | 1,693.5 | 1,534.2 | 1,571.9
China [Member] |  |  |  |  |  |  |  |  |  |  |
Contribution margin |  |  |  |  |  |  |  |  |  |  |
Total Contribution margin |  |  |  |  |  |  |  |  | 915.0 | 790.7 | 789.3
Other operating income |  |  |  |  |  |  |  |  | $ (29.8) | $ (50.8) | $ (34.2)
[1] | The fourth quarters of both 2018 and 2017 include the impact of U.S. Tax Reform enacted during the fourth quarter of 2017, as described further in Note 12, Income Taxes.

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