Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

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

Share-Based Compensation Expense

Share-based compensation expense was as follows (in millions):

	For the Years Ended December 31,
	2016			2015			2014
Total expense, pre-tax		57.3			46.4			49.4
Tax benefit related to awards		(31.5	)		(14.5	)		(15.5	)
Total expense, net of tax	$	25.8		$	31.9		$	33.9

Summary of Stock Option Activity

A summary of stock option activity for the year ended December 31, 2016 is as follows (options in thousands):

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Intrinsic Value (in millions)
Outstanding at January 1, 2016		7,931		$	78.73
Options granted		2,109			105.97
Options exercised		(1,786	)		73.37
Options forfeited		(312	)		104.58
Options expired		(41	)		83.00
Outstanding at December 31, 2016		7,901		$	86.21		6.2	$	149.6
Vested or expected to vest as of December 31, 2016		7,377		$	84.90		6.0	$	148.4
Exercisable at December 31, 2016		4,316		$	72.23		4.1	$	136.6

Weighted Average Fair Value for Stock Options Granted

The following table presents information regarding the weighted average fair value of stock options granted, the assumptions used to determine fair value, and the intrinsic value of options exercised in the indicated year:

	For the Years Ended December 31,
	2016			2015			2014
Dividend yield		0.9	%		0.8	%		0.9	%
Volatility		21.9	%		22.2	%		25.2	%
Risk-free interest rate		1.4	%		1.7	%		1.8	%
Expected life (years)		5.3			5.3			5.5
Weighted average fair value of options granted	$	21.30		$	22.30		$	22.59
Intrinsic value of options exercised (in millions)	$	73.0		$	49.4		$	99.6

Summary of Nonvested RSU Activity

A summary of nonvested RSU activity for the year ended December 31, 2016 is as follows (RSUs in thousands):

	RSUs			Weighted Average Grant Date Fair Value
Outstanding at January 1, 2016		1,300		$	91.64
Granted		623			107.90
Vested		(236	)		77.79
Forfeited		(293	)		88.49
Outstanding at December 31, 2016		1,394			102.04