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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Earnings Per Share [Abstract] |  |  |  |
Shares repurchased | 0.3 |  |  |
Average price per share | $ 206.81 |  |  |
Numerator |  |  |  |
Net income (controlling interest) | $ 104.3 | $ 75.2 | $ 281.5 | $ 202.3
Convertible securities interest expense, net | 3.8 | 2.6 | 0 | 0
Net income (controlling interest), as adjusted | $ 108.1 | $ 77.8 | $ 281.5 | $ 202.3
Denominator |  |  |  |
Average shares outstanding—basic (in shares) | 55.6 | 53.2 | 54.9 | 53.0
Effect of dilutive instruments: |  |  |  |
Contingently convertible securities (in shares) | 2.1 | 2.0 | 0 | 0
Stock options and restricted stock (in shares) | 1.1 | 1.3 | 1.1 | 1.4
Forward equity (in shares) | 0 | 0.4 | 0.1 | 0.3
Average shares outstanding—diluted (in shares) | 58.8 | 56.9 | 56.1 | 54.7

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