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Share-Based Compensation (Details 2) (Nonvested stock awards, USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	Apr. 30, 2012 Y
Nonvested stock awards
Nonvested Stock Shares
Granted (in shares)	1,205,698
Nonvested Stock Shares, Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 33.23
Total fair value of shares vested	$ 40.1
Period for expense amortized (in years)	4

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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