Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Stock-Based Compensation [Abstract]

Stock -based compensation expense recognized during the period

	Quarter Ended June 30,				Six Months Ended June 30,
(In millions)	2012		2011		2012		2011
Amounts included in:
Corporate expense	$	4.1	$	1.8	$	14.2	$	5.6
Property, general, administrative, and other		17.6		2.6		19.0		4.7
Total stock-based compensation expense	$	21.7	$	4.4	$	33.2	$	10.3

Summary of share-based option activity for the period

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2011		8,744,649		$	38.15
Granted		397,951		$	15.11
Canceled		(617,678	)	$	26.25
Outstanding at June 30, 2012		8,524,922		$	32.85
Vested and expected to vest at June 30, 2012		7,210,354		$	32.04
Exercisable at June 30, 2012		4,531,956		$	28.15