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Selected Quarterly Data - Schedule Of Selected Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 892.4 | $ 806.1 | $ 756.2 | $ 674.2 | $ 756.9 | $ 682.9 | $ 670.1 | $ 594.5 | $ 3,128.9 | $ 2,704.4 | $ 2,384.4
Gross profit | 633.3 | 566.8 | 527.9 | 466.1 | 527.2 | 487.0 | 470.9 | 405.0 | 2,194.1 | 1,890.1 | 1,577.9
Net income | $ (38.8) | $ 297.5 | $ 221.5 | $ 179.8 | $ 204.0 | $ 211.0 | $ 184.5 | $ 136.4 | $ 660.0 | $ 735.9 | $ 588.8
Basic net income per share (usd per share) | $ (0.35) | $ 2.66 | $ 2.00 | $ 1.61 | $ 1.75 | $ 1.82 | $ 1.61 | $ 1.21 | $ 5.91 | $ 6.40 | $ 5.29
Diluted net income per share (usd per share) | $ (0.35) | $ 2.55 | $ 1.92 | $ 1.56 | $ 1.71 | $ 1.77 | $ 1.57 | $ 1.18 | $ 5.67 | $ 6.24 | $ 5.18
Income tax (expense) related to the 2017 Tax Act | $ (317.8) | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  | $ (47.6) |  |
Excess tax benefits related to share-based compensation arrangements | 19.9 | 19.7 | 30.6 | 32.6 |  |  |  |  | $ 102.8 | $ 0.0 | $ 0.0
Certain one-time tax benefits | 0.0 | 68.4 | 0.0 | 0.0 |  |  |  |  |  |  |
Pre-tax medical device excise tax refund benefit |  |  |  |  | $ 0.0 | $ 7.1 | $ 0.0 | $ 0.0 |  |  |
Audit settlement and expiration of the statutes of limitations in multiple jurisdictions |  |  |  |  | 0.0 | 15.8 | 0.0 | 0.0 |  |  |
Includes pre-tax litigation (charges) | $ 1.2 | $ (9.7) | $ 4.5 | $ (21.3) | $ (5.5) | $ 0.0 | $ (4.4) | $ (2.2) |  |  |

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