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Business Combinations (Details 3) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Summary of unaudited consolidated pro forma results of operations |  |
Revenues | $ 15,136.2 | $ 14,026.4
Income from continuing operations | 264.2 | 221.9
Net income | $ 260.5 | $ 214.8
Income from continuing operations per diluted common share (in dollars per share) | $ 2.92 | $ 2.46
Net income per diluted common share (in dollars per share) | $ 2.88 | $ 2.38

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