Net Earnings Per Common Share (Tables)

6 Months Ended

Jun. 30, 2011

Net Earnings Per Common Share [Abstract]

Calculation of basic and diluted net earnings per common share

	Three Months						Six Months
	Ended						Ended
	June 30,						June 30,
	2011			2010			2011			2010
Basic Net Earnings Per Common Share:
Numerator
Net earnings available to common stockholders	$	65.0		$	67.0		$	124.7		$	128.1
Distributed and allocated undistributed net earnings to non-vested restricted stockholders		(0.4	)		(0.5	)		(0.8	)		(0.9	)
Distributed and allocated undistributed net earnings to common stockholders		64.6			66.5			123.9			127.2
Distributed net earnings—dividends paid to common stockholders		(20.7	)		(19.0	)		(41.4	)		(38.0	)
Allocation of undistributed net earnings to common stockholders	$	43.9		$	47.5		$	82.5		$	89.2
Denominator
Weighted average number of common shares outstanding—basic		159.2			158.3			159.0			158.1
Basic net earnings per common share:
Distributed net earnings to common stockholders	$	0.13		$	0.12		$	0.26		$	0.24
Allocated undistributed net earnings to common stockholders		0.28			0.30			0.52			0.56
Basic net earnings per common share:	$	0.41		$	0.42		$	0.78		$	0.80
Diluted Net Earnings Per Common Share:
Numerator
Distributed and allocated undistributed net earnings to common stockholders	$	64.6		$	66.5		$	123.9		$	127.2
Add: Allocated undistributed net earnings to non-vested restricted stockholders		0.3			0.3			0.5			0.6
Less: Undistributed net earnings reallocated to non-vested restricted stockholders		(0.3	)		(0.3	)		(0.5	)		(0.6	)
Net earnings available to common stockholders—diluted	$	64.6		$	66.5		$	123.9		$	127.2
Denominator
Weighted average number of common shares outstanding—basic		159.2			158.3			159.0			158.1
Effect of assumed issuance of Settlement agreement shares		18.0			18.0			18.0			18.0
Effect of non-vested restricted stock and restricted stock units		0.3			0.2			0.2			0.2
Weighted average number of common shares outstanding—diluted		177.5			176.5			177.2			176.3
Diluted net earnings per common share	$	0.37		$	0.38		$	0.70		$	0.72