Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Values of Options Based on Stock Price at Grant Date and Assumptions

The expected term is based on the period of time that options granted are expected to be outstanding based on historical experience.

	2015			2014			2013
Risk-free interest rate		1.35	%		1.51	%		.88	%
Expected volatility		28	%		34	%		44	%
Expected dividend yield		3.4	%		3.4	%		3.3	%
Expected term		5 years			5 years			5 years
Weighted average grant date fair value of options per share		$ 10.98			$ 13.17			$ 13.78

Activity Under Company's Stock Plans

A summary of activity under the Company’s stock plans is presented below:
	2015		2014		2013
Intrinsic value of options exercised		$   14.1		$   20.9		$   19.6
Cash received from stock option exercises		21.8		29.1		31.0
Tax benefit related to stock award exercises		3.5		4.4		3.9
Stock based compensation		14.6		16.2		14.0
Tax benefit related to stock based compensation		5.1		5.6		4.9

Stock Option Activity

The summary of options as of December 31, 2015 and changes during the year then ended are presented below:
	NUMBER OF SHARES			PER SHARE EXERCISE PRICE*		REMAINING CONTRACTUAL LIFE IN YEARS*		AGGREGATE INTRINSIC VALUE
Options outstanding at January 1		4,536,700		$	44.25
Granted		569,500			62.46
Exercised		(582,300	)		37.50
Cancelled		(102,300	)		55.17
Options outstanding at December 31		4,421,600		$	47.23		5.69	$	17.5
Vested and expected to vest		4,325,600		$	46.93		5.63	$	17.5
Exercisable		2,590,700		$	41.14		4.04	$	17.5

*  Weighted Average

Nonvested Restricted Shares Activity

The summary of nonvested restricted shares as of December 31, 2015 and changes during the year then ended is presented below:

NONVESTED SHARES	NUMBER OF SHARES			GRANT DATE FAIR VALUE*
Nonvested awards outstanding at January 1		185,700		$	51.60
Granted		112,000			63.39
Vested		(115,800	)		51.70
Nonvested awards outstanding at December 31		181,900		$	58.79
*  Weighted Average

Dilutive and Antidilutive Options

The dilutive and antidilutive options are shown separately in the table below:
Year Ended December 31,	2015		2014		2013
Additional shares		906,100		1,120,500		932,000
Antidilutive options		1,180,400		673,700		873,800