STOCK COMPENSATION PLANS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2017
Summary of Changes in Options Outstanding Under the Stock Incentive Plans [Rollforward]
Shares authorized for issuance under the 2008 and 2000 Stock Incentive Plans			10.7
Shares available for grant under the Company's stock option plans			8.3
Award 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			$ 82.1
Stock Options Exercised, Impact Disclosures
Cash received by the Company	$ 52.6	$ 82.6	43.9
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	13.6	16.2	13.4
Aggregate intrinsic value	$ 35.5	$ 42.2	$ 34.8
Assumptions the Company Used to Develop Fair Value Estimates
Fair value of the employee's purchase right	$ 23.32	$ 21.95	$ 31.54
Fair Values of Options Granted and the Employee's Purchase Right in the Stock Purchase Plan
Stock option plan expense	$ 0.0	$ 2.2	$ 0.9
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, revenue, operating income, earnings before income taxes and total shareholder return targets
Restricted stock and performance share compensation expense	104.1	83.8	$ 100.8
Unrecognized compensation cost related to nonvested restricted stock and performance share-based compensation arrangements			$ 104.0
Unrecognized compensation cost weighted average expected future recognition period (in years)			1 year 10 months
Employee Stock Purchase Plan Disclosure
Shares of common stock authorized for issuance under the employee stock purchase plan			2.4
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			0.3
Expense related to the Company's employee stock purchase plan	$ 5.5	$ 4.1	$ 8.0
Employee Stock Purchase Plan [Member]
Assumptions the Company Used to Develop Fair Value Estimates
Risk free interest rate	0.50%	0.30%	1.30%
Expected volatility	20.00%	20.00%	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			1.6
Number of options granted			0.9
Number of options vested			(0.9)
Nonvested, end of period			1.5
Weighted-average grant date fair value, nonvested, beginning of period			$ 108.23
Weighted-average grant date fair value, granted			132.48
Weighted-average grant date fair value, vested			$ 100.86
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period			0.1
Weighted-average grant date fair value, nonvested, end of period			$ 121.36
Employee Stock Purchase Plan Disclosure
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 118.74
Stock Options [Member]
Changes in Options Outstanding Under the Stock Incentive Plans, Additional Disclosures
Number of options outstanding, beginning balance			1.6
Number of options granted			0.1
Number of options exercised			(0.5)
Number of options cancelled			0.0
Number of options outstanding, ending balance			1.2
Weighted-average exercise price per option, outstanding, beginning balance			$ 82.43
Weighted-average exercise price per option granted			130.60
Weighted-average exercise price per option exercised			83.85
Weighted-average exercise price per option cancelled			80.37
Weighted-average exercise price per option, outstanding, ending balance			$ 86.55
Weighted-average remaining contractual term of options outstanding (in years)			3 years 11 months
Aggregate intrinsic value of options outstanding			$ 85.4
Stock Options Vested and Expected to Vest at December 31, 2011
Number of options vested and expected to vest			1.1
Weighted-average exercise price per option, vested and expected to vest options			$ 81.73
Weighted-average exercise price per exercisable option			$ 81.73
Weighted-average remaining contractual term, vested and expected to vest options (in years)			3 years 4 months
Number of options exercisable			1.1
Weighted-average remaining contractual term, exercisable options (in years)			3 years 4 months
Aggregate intrinsic value, exercisable options			$ 82.1