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Business Acquisitions and Assets and Liabilities Held for Sale (Tables) | 12 Months Ended
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Dec. 31, 2018
Business Combinations [Abstract] |
Pro Forma Information | The following unaudited pro forma summary presents consolidated information as if the acquisition of Deltek had occurred on January 1, 2016:
| Pro forma Year ended December 31,
| 2016
Net revenues | $ | 4,268.1 |
Net income | 656.4 |
Earnings per share, basic | 6.48 |
Earnings per share, diluted | 6.41 |

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