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Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Notes to Financial Statements [Abstract]

Stock Based Compensation Expense

		Three months ended June 30,								Six months ended  June 30,
		2011				2010				2011				2010
Stock based compensation		$	7.7			$	6.1			$	15.8			$	13.1
Tax effect recognized in net income			2.7				2.1				5.5				4.6
Windfall tax benefit/(shortfall), net			0.9				1.8				3.7				2.9

Weighted average assumptions used to value option grants

	Six months ended June 30,
	2011		2010
Fair value per share ($)	24.86		16.84
Risk-free interest rate (%)	2.07		2.36
Expected option life (years)	5.33		5.38
Expected volatility (%)	35.17		34.54
Expected dividend yield (%)	0.59		0.72

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- Definition

Disclosure of compensation-related costs for share-based compensation which may include disclosure of policies, compensation plan details, allocation of stock compensation, incentive distributions, share-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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This table provides the weighted average assumptions used to estimate the fair value of options granted during the current and prior periods using the Black-Scholes Option pricing model.

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