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Net Earnings per Common Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
 [1]
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator                      
Net earnings available to common stockholders $ 123.5 $ 86.6 $ 28.1 $ 97.2 $ 66.3 $ 60.8 $ 60.1 $ 70.9 $ 335.4 $ 258.1 [2] $ 125.8 [2]
Distributed and allocated undistributed net earnings to non- vested restricted stockholders                 (2.2) (1.6) (0.7)
Distributed and allocated undistributed net earnings to common stockholders                 333.2 256.5 125.1
Distributed net earnings - dividends paid to common stockholders                 (106.2) (110.1) (101.3)
Allocation of undistributed net earnings to common stockholders                 $ 227.0 $ 146.4 $ 23.8
Denominator                      
Weighted average number of common shares outstanding - basic                 203.9 210.0 194.6
Basic net earnings per common share:                      
Distributed net earnings to common stockholders                 $ 0.52 $ 0.52 $ 0.52
Allocated undistributed net earnings to common stockholders                 1.11 0.70 0.13
Net earnings per common share - basic $ 0.63 [3] $ 0.43 [3] $ 0.13 [3] $ 0.46 [3] $ 0.31 $ 0.29 $ 0.28 $ 0.34 $ 1.63 $ 1.22 $ 0.65
Numerator                      
Distributed and allocated undistributed net earnings to common stockholders                 $ 333.2 $ 256.5 $ 125.1
Add: Allocated undistributed net earnings to unvested restricted stockholders                 1.6 1.0 0.2
Less: Undistributed net earnings reallocated to non- vested restricted stockholders                 (1.6) (0.9) (0.1)
Net earnings available to common stockholders - diluted                 $ 333.2 $ 256.6 $ 125.2
Denominator                      
Weighted average number of common shares outstanding - basic                 203.9 210.0 194.6
Effect of assumed issuance of Settlement agreement shares [4]                   1.6 18.0
Effect of contingently issuable shares [4]                 1.3 0.9 0.7
Effect of unvested restricted stock units [4]                 0.7 0.8 0.6
Weighted average number of common shares outstanding - diluted under two-class                 205.9 213.3 213.9
Effect of unvested restricted stock - participating security [4]                 0.8 0.6 0.3
Weighted average number of common shares outstanding - diluted under treasury stock                 206.7 213.9 214.2
Diluted net earnings per common share $ 0.62 [3] $ 0.42 [3] $ 0.13 [3] $ 0.46 [3] $ 0.31 $ 0.28 $ 0.28 $ 0.33 $ 1.62 $ 1.20 $ 0.58
[1] During the fourth quarter of 2015, adjustments were made to prior year provisions which resulted in an increase in earnings per share. Refer to Note 16 “Income Taxes” for further information.
[2] For the years ended December 31, 2014 and December 31, 2013, certain foreign currency translation adjustments were misclassified on the Consolidated Statements of Comprehensive Income (Loss) in deferred pension items and unrealized losses on cash flow hedge derivative instruments. See Note 2 “Summary of Significant Accounting Policies and Recently Issued Accounting Standards” under the heading “Reclassifications and Revisions” for further discussion of the revisions.
[3] The sum of the quarterly per share amounts may not agree to the respective annual amounts due to rounding.
[4] Provides for the following items if their inclusion is dilutive: (i) the effect of the issuance of 18 million shares of common stock reserved for the Settlement agreement as defined and (ii) the effect of non-vested restricted stock, restricted stock units and contingently issuable shares using the treasury stock method.