Share-Based Compensation and Capital Stock (Tables)

3 Months Ended

Mar. 31, 2018

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

Pre-Tax Stock-Based Compensation Expenses And Associated Income Tax Benefits

The components of the Company’s pretax share-based compensation expense and associated income tax benefits are as follows for the three months ended March 31, 2018 and 2017:

	Three Months Ended
	March 31,
(in millions)	2018		2017
Stock options	$	0.7	$	1.1
Restricted stock	1.7		1.7
Performance vested restricted stock units	1.1		1.0
Total	$	3.5	$	3.8
Income tax benefits	$	0.8	$	1.4

Summary Of Change In Stock-Based Award Activity

A summary of stock-based award activity as of March 31, 2018 and changes during the three months ended are presented below:

	Stock Options					Restricted Stock				Performance Vested Restricted Stock Units
	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Shares		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2018	1,976,326		$	50.80		348,876		$	57.05	294,204		$	56.95
Granted	109,045		81.55			72,671		81.55		93,809		81.55
Exercised/Vested	(414,116	)	55.66			(70,450	)	54.94		(25,232	)	63.47
Expired	(2,018	)	63.47			—		—		—		—
Forfeited	(10,095	)	54.08			(13,509	)	51.67		(6,833	)	60.42
Outstanding at March 31, 2018	1,659,142		$	51.57	4.0 years	337,588		$	62.98	355,948		$	62.90
Options exercisable at March 31, 2018	1,169,868		$	47.44	3.5 years

Weighted Average Assumptions Of Black-Scholes Option-Pricing Model

The fair value of the options granted was estimated on the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions:

	2018 Grants
Risk-free interest rate	2.58		%
Expected volatility	21.17		%
Expected life of stock option	4.6 years
Dividend yield	1.05		%
Requisite service period	4 years
Contractual life	7 years
Weighted average fair value of options granted (per option)	$	16.27