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	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator
Net earnings (loss) available to common stockholders	$ 56.3	$ (13.7)	$ 59.0	$ (19.6)
Distributed and allocated undistributed net earnings (loss) to non-vested restricted stockholders	(0.2)	(0.1)	(0.3)	(0.2)
Distributed and allocated undistributed net earnings (loss) to common stockholders	56.1	(13.8)	58.7	(19.8)
Distributed net earnings - dividends paid to common stockholders	(25.3)	(25.1)	(50.6)	(50.2)
Allocation of undistributed net earnings (loss) to common stockholders	30.8	(38.9)	8.1	(70.0)
Denominator
Weighted average number of common shares outstanding - basic	194.8	193.0	194.3	192.4
Basic net earnings (loss) per common share:
Distributed net earnings (loss) to common stockholders	$ 0.13	$ 0.13	$ 0.26	$ 0.26
Allocated undistributed net earnings (loss) to common stockholders	$ 0.16	$ (0.20)	$ 0.04	$ (0.36)
Net earnings (loss) per common share-basic	$ 0.29	$ (0.07)	$ 0.30	$ (0.10)
Numerator
Distributed and allocated undistributed net earnings (loss) to common stockholders	56.1	(13.8)	58.7	(19.8)
Add: Allocated undistributed net earnings (loss) to non-vested restricted stockholders	0.1		0.1
Less: Undistributed net earnings (loss) reallocated to non-vested restricted stockholders	(0.1)		(0.1)
Net earnings (loss) available to common stockholders - diluted	$ 56.1	$ (13.8)	$ 58.7	$ (19.8)
Denominator
Weighted average number of common shares outstanding - basic	194.8	193.0	194.3	192.4
Effect of assumed issuance of Settlement agreement shares	18.0		18.0
Effect of non-vested restricted stock units	0.8		0.9
Weighted average number of common shares outstanding - diluted	213.6	193.0	213.2	192.4
Diluted net earnings (loss) per common share	$ 0.26	$ (0.07)	$ 0.28	$ (0.10)

Distributed net earnings dividends common stock cash.

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The amount resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of convertible securities.

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Dividends declared in the period and the contractual amount of dividends (or interest on participating income bonds) that must be paid per security.

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The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Aggregate of earnings distributed and earnings allocated to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed.

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