Stock Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Option Activity

The following table provides a summary of option activity during the nine months ended September 30, 2014:

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
				Exercise		Contractual		Intrinsic
	Options			Price		Term		Value
Outstanding at December 31, 2013		8.8		$	39.47
Granted		1.1			69.60
Exercised		(1.0	)		24.23
Cancelled		(0.1	)		55.32
Outstanding at September 30, 2014		8.8		$	44.90		6.3	$	222.1
Exercisable at September 30, 2014		4.5		$	29.79		4.3	$	182.5

Information Regarding Intrinsic Value of Stock Options Exercised and Stock Compensation Expense Related to Stock Option Awards

The following table provides information regarding the intrinsic value of stock options exercised and stock compensation expense related to stock option awards:

	Three Months Ended				Nine Months Ended
	September 30,		September 30,		September 30,		September 30,
	2014		2013		2014		2013
Intrinsic Value of Stock Options Exercised	$	7.3	$	5.1	$	44.5	$	31.0
Stock Compensation Expense Related to Stock    Option Awards	$	1.7	$	1.9	$	13.5	$	13.3
Issued Stock Options		0.0		0.0		1.1		1.6
Weighted Average Fair Value of Stock Options    issued (per share)	$	12.76	$	11.31	$	12.84	$	10.90
Fair Value of Stock Options Issued	$	0.1	$	0.5	$	14.7	$	17.8

Assumptions Used in Valuation of Issued Stock Options

The following table provides a summary of the assumptions used in the valuation of issued stock options:

	Three Months Ended						Nine Months Ended
	September 30,			September 30,			September 30,			September 30,
	2014			2013			2014			2013
Risk-free interest rate		2.0	%		1.7	%		2.0	%		1.4	%
Expected life in Years		6.1			6.1			6.2			6.2
Expected volatility		20.4	%		21.2	%		20.4	%		21.2	%
Dividend Yield		1.8	%		1.8	%		1.8	%		1.8	%