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Earnings Per Share (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Numerator: |  |  |  |
Net income (controlling interest), as adjusted | $ 54.9 | $ 40.1 | $ 98.9 | $ 124.6
Denominator: |  |  |  |
Average shares outstanding - basic | 51.7 | 51.9 | 51.6 | 51.9
Effect of dilutive instruments: |  |  |  |
Stock options and other awards (in shares) | 1.3 | 1.1 | 1.3 | 1.3
Average shares outstanding - diluted | 53.0 | 53.0 | 52.9 | 53.2
Stock transactions: |  |  |  |
Shares repurchased under share repurchase programs |  |  | 0.6 |
Stock options and other awards |  |  |  |
Anti-dilutive securities |  |  |  |
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) | 0.6 | 1.2 | 0.6 | 1.2
Senior convertible securities |  |  |  |
Anti-dilutive securities |  |  |  |
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) | 3.7 | 3.7 | 3.7 | 3.7
Junior convertible trust preferred securities |  |  |  |
Anti-dilutive securities |  |  |  |
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) | 4.2 | 4.2 | 4.2 | 4.2
Forward equity sales |  |  |  |
Anti-dilutive securities |  |  |  |
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) | 0.3 |  | 0.3 |

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