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Net Earnings (Loss) per Common Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Common Share (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator      
Net earnings (loss) available to common stockholders $ 124.2 $ (1,410.3) $ 149.1
Distributed and allocated undistributed net earnings (loss) to non-vested restricted stockholders (0.6) (0.5) (0.9)
Distributed and allocated undistributed net earnings (loss) to common stockholders 123.6 (1,410.8) 148.2
Distributed net earnings - dividends paid to common stockholders (101.3) (100.4) (86.8)
Allocation of undistributed net earnings (loss) to common stockholders 22.3 (1,511.2) 61.4
Denominator      
Weighted average number of common shares outstanding - basic 194.6 192.8 167.0
Basic net earnings (loss) per common share:      
Distributed net earnings (loss) to common stockholders $ 0.52 $ 0.52 $ 0.52
Allocated undistributed net earnings (loss) to common stockholders $ 0.12 $ (7.83) $ 0.37
Net earnings (loss) per common share - basic $ 0.64 $ (7.31) $ 0.89
Numerator      
Distributed and allocated undistributed net earnings (loss) to common stockholders 123.6 (1,410.8) 148.2
Add: Allocated undistributed net earnings (loss) to non-vested restricted stockholders 0.1   0.4
Less: Undistributed net earnings (loss) reallocated to non-vested restricted stockholders (0.1)   (0.3)
Net earnings (loss) available to common stockholders - diluted $ 123.6 $ (1,410.8) $ 148.3
Denominator      
Weighted average number of common shares outstanding - basic 194.6 192.8 167.0
Effect of assumed issuance of Settlement agreement shares 18.0   18.0
Effect of non-vested restricted stock units 0.9   0.4
Weighted average number of common shares outstanding - diluted 213.5 192.8 185.4
Diluted net earnings (loss) per common share $ 0.58 $ (7.31) $ 0.80