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Net Earnings Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Numerator |  |  |
Net earnings available to common stockholders | $ 149.1 | $ 255.9 | $ 244.3
Distributed and allocated undistributed net earnings to non-vested restricted stockholders | (0.9) | (1.6) | (1.9)
Distributed and allocated undistributed net earnings to common stockholders | 148.2 | 254.3 | 242.4
Distributed net earnings-dividends paid to common stockholders | (86.8) | (79.2) | (75.6)
Allocation of undistributed net earnings to common stockholders | 61.4 | 175.1 | 166.8
Denominator |  |  |
Weighted average number of common shares outstanding-basic | 167.0 | 158.3 | 157.2
Basic net earnings per common share: |  |  |
Distributed net earnings to common stockholders | $ 0.52 | $ 0.50 | $ 0.48
Allocated undistributed net earnings to common stockholders | $ 0.37 | $ 1.11 | $ 1.06
Basic net earnings per common share: | $ 0.89 | $ 1.61 | $ 1.54
Numerator |  |  |
Distributed and allocated undistributed net earnings to common stockholders | 148.2 | 254.3 | 242.4
Add: Allocated undistributed net earnings to non-vested restricted stockholders | 0.4 | 1.1 | 1.3
Interest on 3% Convertible Senior Notes, net of taxes |  |  | 4.4
Less: Undistributed net earnings reallocated to non-vested restricted stockholders | (0.3) | (1.0) | (1.2)
Net earnings available to common stockholders - diluted | $ 148.3 | $ 254.4 | $ 246.9
Denominator |  |  |
Weighted average number of common shares outstanding-basic | 167.0 | 158.3 | 157.2
Effect of assumed issuance of Settlement agreement shares | 18.0 | 18.0 | 18.0
Effect of non-vested restricted stock units | 0.4 | 0.4 | 0.2
Effect of conversion of 3% Convertible Senior Notes |  |  | 7.2
Weighted average number of common shares outstanding-diluted | 185.4 | 176.7 | 182.6
Diluted net earnings per common share | $ 0.80 | $ 1.44 | $ 1.35

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