STOCK COMPENSATION PLANS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of Changes in Options Outstanding Under the Stock Incentive Plans [Rollforward]
Shares available for grant under the Company's stock option plans	1.7
Shares authorized for issuance under the 2008 and 2000 Stock Incentive Plans	23.8
Vesting period (in years)	3 years
Stock Options Vested and Expected to Vest at December 31, 2011
Aggregate intrinsic value, vested and expected to vest options	$ 84.5
Assumptions the Company Used to Develop Fair Value Estimates
Fair value per option	$ 17.06	$ 14.12	$ 10.85
Stock Options Exercised, Impact Disclosures
Cash received by the Company	106.1	73.7	14.3
Tax benefits realized	17.8	13.2	2.7
Aggregate intrinsic value	45.5	33.4	7.0
Stock option plan expense	24.9	20.7	18.7
Restricted Stock and Performance Shares
Restricted stock, vesting increment	one third increments beginning on the first anniversary of the grant
Performance share awards, vesting conditions	Performance share awards are subject to certain earnings per share and revenue targets
Restricted stock and performance share compensation expense	21.3	16.1	13.6
Unrecognized compensation cost related to nonvested restricted stock and performance share-based compensation arrangements	19.6
Unrecognized compensation cost weighted average expected future recognition period (in years)	1.6
Employee Stock Purchase Plan Disclosure
Shares of common stock authorized for issuance under the employee stock purchase plan	4.5
The employee stock purchase plan permits employees to purchase shares of common stock at a certain percentage of the market price (in hundredths)	85.00%
Number of shares purchased by eligible employees	0.2	0.2	0.2
Expense related to the Company's employee stock purchase plan	2.7	2.0	3.2
Fair value of the employee's purchase right	$ 15.58	$ 15.39	$ 14.28
Stock Options [Member]
Changes in Options Outstanding Under the Stock Incentive Plans, Additional Disclosures
Number of options outstanding, beginning balance	6.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period	1.5
Number of options exercised	(1.6)
Number of options cancelled	(0.2)
Number of options outstanding, ending balance	6.3	6.6
Weighted-average exercise price per option, outstanding, beginning balance	$ 67.84
Weighted-average exercise price per option granted	$ 90.86
Weighted-average exercise price per option exercised	$ 65.67
Weighted-average exercise price per option cancelled	$ 77.06
Weighted-average exercise price per option, outstanding, ending balance	$ 73.66	$ 67.84
Weighted-average remaining contractual term of options outstanding (in years)	7.2
Aggregate intrinsic value of options outstanding	84.9
Stock Options Vested and Expected to Vest at December 31, 2011
Number of options vested and expected to vest	6.2
Weighted-average exercise price per option, vested and expected to vest options	$ 73.52
Weighted-average remaining contractual term, vested and expected to vest options (in years)	7.2
Number of options exercisable	3.2
Weighted-average exercise price per exercisable option	$ 69.44
Weighted-average remaining contractual term, exercisable options (in years)	6.0
Aggregate intrinsic value, exercisable options	$ 53.1
Assumptions the Company Used to Develop Fair Value Estimates
Weighted average expected life (in years)	3.4	3.1	3.0
Risk free interest rate	1.00%	1.50%	1.10%
Expected volatility	20.00%	30.00%	20.00%
Expected dividend yield	0.00%	0.00%	0.00%
Restricted Stock and Performance Shares [Member]
Summary of Nonvested Shares
Nonvested, beginning of period	0.6
Number of options granted	0.2
Vested	(0.2)
Nonvested, end of period	0.6
Weighted-average grant date fair value, nonvested, beginning of period	$ 68.26
Weighted-average grant date fair value, granted	$ 90.84
Weighted-average grant date fair value, vested	$ 73.02
Weighted-average grant date fair value, nonvested, end of period	$ 74.39
Employee Stock Purchase Plan [Member]
Assumptions the Company Used to Develop Fair Value Estimates
Risk free interest rate	0.10%	0.20%	0.20%
Expected volatility	20.00%	20.00%	20.00%
Expected dividend yield	0.00%	0.00%	0.00%

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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