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Selected Quarterly Data | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Information [Abstract] |
Selected Quarterly Data |
| Three Months Ended
| December 31, 2017 |  | September 30, 2017 |  | June 30, 2017 |  | March 31, 2017
Revenue | $ | 892.4 |  |  | $ | 806.1 |  |  | $ | 756.2 |  |  | $ | 674.2 |
Gross profit | $ | 633.3 |  |  | $ | 566.8 |  |  | $ | 527.9 |  |  | $ | 466.1 |
Net income (loss) (1)(2) | $ | (38.8 | ) |  | $ | 297.5 |  |  | $ | 221.5 |  |  | $ | 179.8 |
Net income (loss) per share: |  |  |  |  |  |  |
Basic | $ | (0.35 | ) |  | $ | 2.66 |  |  | $ | 2.00 |  |  | $ | 1.61 |
Diluted | $ | (0.35 | ) |  | $ | 2.55 |  |  | $ | 1.92 |  |  | $ | 1.56 |
(1) Includes discrete tax benefits (expense) as follows: |  |  |  |  |  |  |
Income tax (expense) related to the 2017 Tax Act | $ | (317.8 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |
Excess tax benefits related to share-based compensation arrangements | $ | 19.9 |  |  | $ | 19.7 |  |  | $ | 30.6 |  |  | $ | 32.6 |
Certain one-time tax benefits | $ | — |  |  | $ | 68.4 |  |  | $ | — |  |  | $ | — |
(2) Includes pre-tax litigation benefits (charges) | $ | 1.2 |  |  | $ | (9.7 | ) |  | $ | 4.5 |  |  | $ | (21.3 | )
| Three Months Ended
| December 31, 2016 |  | September 30, 2016 |  | June 30, 2016 |  | March 31, 2016
Revenue | $ | 756.9 |  |  | $ | 682.9 |  |  | $ | 670.1 |  |  | $ | 594.5 |
Gross profit (1) | $ | 527.2 |  |  | $ | 487.0 |  |  | $ | 470.9 |  |  | $ | 405.0 |
Net income (1)(2)(3) | $ | 204.0 |  |  | $ | 211.0 |  |  | $ | 184.5 |  |  | $ | 136.4 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 1.75 |  |  | $ | 1.82 |  |  | $ | 1.61 |  |  | $ | 1.21 |
Diluted | $ | 1.71 |  |  | $ | 1.77 |  |  | $ | 1.57 |  |  | $ | 1.18 |
(1) Includes pre-tax medical device excise tax refund benefit | $ | — |  |  | $ | 7.1 |  |  | $ | — |  |  | $ | — |
(2) Includes discrete tax benefits as follows: |  |  |  |  |  |  |
Audit settlement and expiration of the statutes of limitations in multiple jurisdictions | $ | — |  |  | $ | 15.8 |  |  | $ | — |  |  | $ | — |
(3) Includes pre-tax litigation (charges) | $ | (5.5 | ) |  | $ | — |  |  | $ | (4.4 | ) |  | $ | (2.2 | )

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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- References No definition available. + Details
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