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Business Combinations (Details 3) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Summary of unaudited consolidated pro forma results of operations |  |
Revenues | $ 4,080.9 | $ 3,809.9
Income from continuing operations | 66.0 | 69.2
Net income | $ 67.4 | $ 69.6
Income from continuing operations per diluted common share (in dollars per share) | $ 0.73 | $ 0.76
Net income per diluted common share (in dollars per share) | $ 0.74 | $ 0.77

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