| GAAP | Non-GAAP | ||||||||||||||||||||
| (in millions, except percentages and per share data) | FY 2017 | FY 2016 |
%
Change | FY 2017 | FY 2016 |
%
Change | |||||||||||||||
| Revenue | $ | 1,095.3 | $ | 988.5 | 11 | % | $ | 1,098.1 | $ | 988.6 | 11 | % | |||||||||
| Net income | $ | 259.3 | $ | 265.6 | (2 | )% | $ | 347.9 | $ | 322.9 | 8 | % | |||||||||
| Earnings per share | $ | 2.98 | $ | 2.99 | — | % | $ | 4.01 | $ | 3.63 | 10 | % | |||||||||
| Operating profit margin | 35.7 | % | 38.1 | % | 46.4 | % | 47.0 | % | |||||||||||||
| Operating cash flow | $ | 430.4 | $ | 366.0 | 18 | % | |||||||||||||||
The non-GAAP financial results highlighted above, and the non-GAAP financial outlook for 2018 discussed below, represent non-GAAP financial measures. Reconciliations of these measures to the appropriate GAAP measures, for the three and twelve months ended December 31, 2017 and 2016, and for the 2018 financial outlook, are included in the condensed financial information included in this release.
Management's 2018 Financial Outlook
The Company's first quarter and fiscal year 2018 revenue and earnings per share guidance is provided below. The revenue and earnings per share guidance is provided on both a GAAP and a non-GAAP basis, and in accordance with both ASC 605 and ASC 606. Non-GAAP financial measures exclude the income statement effects of acquisition adjustments to deferred revenue, stock-based compensation, amortization of acquired intangible assets and acquisition-related transaction costs.
First Quarter 2018 Guidance
The Company currently expects the following for the quarter ending March 31, 2018:
| (in millions, except per share data) | GAAP | non-GAAP | |
| Revenue under ASC 606 | $261.0 - $281.0 | $261.0 - $281.0 | |
| Diluted earnings per share under ASC 606 | $0.70 - $0.88 | $0.90 - $1.05 | |
| Revenue under ASC 605 | $274.6 - $284.6 | $275.0 - $285.0 | |
| Diluted earnings per share under ASC 605 | $0.82 - $0.92 | $1.02 - $1.09 | |
Fiscal Year 2018 Guidance
The Company currently expects the following for the fiscal year ending December 31, 2018:
| (in millions, except per share data) | GAAP | non-GAAP | |
| Revenue under ASC 606 | $1,152.0 - $1,232.0 | $1,152.0 - $1,232.0 | |
| Diluted earnings per share under ASC 606 | $3.38 - $4.11 | $4.41 - $5.04 | |
| Revenue under ASC 605 | $1,191.3 - $1,226.3 | $1,192.0 - $1,227.0 | |
| Diluted earnings per share under ASC 605 | $3.72 - $4.06 | $4.76 - $5.00 | |
