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Business Combinations (Details 3) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 4,904.4 | $ 4,668.2 | $ 9,402.2 | $ 9,030.1
Income from continuing operations | 94.4 | 82.9 | 171.2 | 152.6
Net income | $ 94.0 | $ 75.3 | $ 169.6 | $ 145.3
Income from continuing operations per diluted common share (in dollars per share) | $ 1.05 | $ 0.92 | $ 1.90 | $ 1.69
Net income per diluted common share (in dollars per share) | $ 1.04 | $ 0.83 | $ 1.88 | $ 1.61

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