Net (Loss) Earnings - Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator
Net (loss) earnings available to common stockholders	$ (13.7)	$ 65.0	$ (19.6)	$ 124.7
Distributed and allocated undistributed net earnings to non-vested restricted stockholders	(0.1)	(0.4)	(0.2)	(0.8)
Distributed and allocated undistributed net (loss) earnings -to common stockholders	(13.8)	64.6	(19.8)	123.9
Distributed net earnings-dividends paid to common stockholders	(25.1)	(20.7)	(50.2)	(41.4)
Allocation of undistributed net (loss) earnings to common stockholders	(38.9)	43.9	(70.0)	82.5
Denominator (1)
Weighted average number of common shares outstanding-basic	193.0	159.2	192.4	159.0
Basic net (loss) earnings per common share:
Distributed net earnings to common stockholders	$ 0.13	$ 0.13	$ 0.26	$ 0.26
Allocated undistributed net (loss) earnings to common stockholders	$ (0.20)	$ 0.28	$ (0.36)	$ 0.52
Basic net (loss) earnings per common share:	$ (0.07)	$ 0.41	$ (0.10)	$ 0.78
Numerator
Distributed and allocated undistributed net (loss) earnings to common stockholders	(13.8)	64.6	(19.8)	123.9
Add: Allocated undistributed net earnings to non-vested restricted stockholders		0.3		0.5
Less: Undistributed net earnings reallocated to non-vested restricted stockholders		(0.3)		(0.5)
Net (loss) earnings available to common stockholders - diluted	$ (13.8)	$ 64.6	$ (19.8)	$ 123.9
Denominator (1) (2)
Weighted average number of common shares outstanding-basic	193.0	159.2	192.4	159.0
Effect of assumed issuance of Settlement agreement shares		18.0		18.0
Effect of non-vested restricted stock and restricted stock units		0.3		0.2
Weighted average number of common shares outstanding-diluted	193.0	177.5	192.4	177.2
Diluted net (loss) earnings per common share	$ (0.07)	$ 0.37	$ (0.10)	$ 0.70

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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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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