Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2016

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

Schedule of stock-based compensation expense and related income tax benefits

Substantially all stock-based compensation expense has been recorded in selling, general and administrative expenses. The following table summarizes stock-based compensation costs and related income tax benefits.

	Year Ended December 31,
	2016			2015			2014
Stock-based compensation expense	$	5.8		$	6.5		$	6.0
Income tax benefit	(2.2		)	(2.5		)	(2.3		)
Stock-based compensation, net of income tax benefit	$	3.6		$	4.0		$	3.7

Schedule of total compensation costs related to the Company's equity awards and amounts recognized

The following table summarizes total compensation costs related to the Company's equity awards and amounts recognized in the year ended December 31, 2016.

	Stock Options			Performance Shares and RSUs
Unrecognized compensation cost — December 31, 2015	$	0.8		$	1.6
Grant date fair value current year grants	1.5			4.2
Compensation expense recognized	(1.7		)	(4.1		)
Unrecognized compensation cost — December 31, 2016	$	0.6		$	1.7
Expected amortization period (in years)	1.7			1.5

Schedule of stock options awarded

The following tables present information regarding stock options awarded during the years ended December 31, 2016, 2015 and 2014.

	2016		2015		2014
Nonqualified stock options granted	113,935		87,930		95,670
Per share weighted-average exercise price	$	58.03	$	59.72	$	43.17
Per share weighted-average grant date fair value	$	13.51	$	16.47	$	12.72

Schedule of assumptions used to determine the grant date fair value of options granted

The weighted-average grant date fair value for stock options granted for the years ended December 31, 2016, 2015 and 2014 was estimated using the Black-Scholes option valuation model with the following assumptions:

	2016		2015		2014
Expected term in years	5.8		5.8		5.9
Risk free interest rate	1.8	%	1.4	%	1.9	%
Volatility	32.1	%	34.4	%	36.5	%
Dividend yield	3.0	%	2.0	%	2.2	%

Schedule of stock option activity under the Omnibus Plan

The following table summarizes stock option activity under the Omnibus Plan for the year ended December 31, 2016:

	Number of Stock Options	Weighted-Average Exercise Price
Options outstanding — December 31, 2015	526,611	$	31.94
Add: Options granted	113,935	$	58.03
Less: Options exercised	105,806	$	27.29
Less: Options forfeited/cancelled	4,278	$	46.89
Options outstanding — December 31, 2016	530,462	$	38.35

Schedule of outstanding and exercisable stock options summarized by exercise price

The status of outstanding and exercisable stock options as of December 31, 2016, summarized by exercise price follows:

	Options Vested or Expected to Vest						Options Exercisable
Exercise Price	Number of Options	Weighted- Average Remaining Contractual Life (Years)	Weighted- Average Exercise Price		Aggregate Intrinsic Value (a)		Number of Options	Weighted- Average Exercise Price		Aggregate Intrinsic Value (a)
$7.41 — $19.42	65,095	3.1	$	13.15	$	4.7	65,095	$	13.15	$	4.7
$21.13 — $32.84	202,695	5.2	$	25.67	12.1		202,695	$	25.67	12.1
$32.87 — $42.82	66,550	6.4	$	42.26	2.9		39,699	$	41.88	1.7
$50.60 — $59.72	192,553	8.6	$	58.45	5.2		28,847	$	58.09	0.8
>$60.55	3,569	9.2	$	60.56	0.1		—	$	60.56	—
	530,462	6.3	$	38.35	$	25.0	336,336	$	27.94	$	19.3

_______________________

(a) Represents the total pre-tax intrinsic value as of December 31, 2016 that option holders would have received had they exercised their options as of such date. The pre-tax intrinsic value is based on the closing market price for the Company's common stock of $85.20 on December 31, 2016.

Schedule of status of the Company's unvested stock options

The following table summarizes the status of the Company's unvested stock options as of December 31, 2016 and activity for the year then ended:

	Number of Stock Options	Weighted-Average Grant Date Fair Value
Outstanding — December 31, 2015	294,017	$	12.09
Add: Options granted	113,935	$	13.51
Less: Options vested	213,826	$	10.07
Outstanding — December 31, 2016	194,126	$	15.15

Summary of activity of unvested stock-based awards

The following table summarizes the activity of the Company's unvested stock-based awards (other than stock options) for the years ended December 31, 2016, 2015 and 2014:

	RSUs		Weighted-Average Grant Date Fair Value		Performance Units		Weighted-Average Grant Date Fair Value
Outstanding — December 31, 2013	152,191		$	24.36	77,000		$	49.28
Shares granted (a)	11,492		$	49.78	60,900		$	74.79
Shares vested	(150,270	)	$	22.60	—		$	—
Performance Shares vested	94,710		$	29.15	(77,000	)	$	35.85
Shares expired or cancelled	(2,829	)	$	29.15	(2,630	)	$	74.79
Outstanding — December 31, 2014	105,294		$	31.15	58,270		$	74.79
Shares granted (a)	13,415		$	61.41	45,060		$	78.32
Shares vested	(105,564	)	$	32.12	(810	)	$	78.32
Performance Shares vested	107,219		$	40.65	(58,270	)	$	74.79
Shares expired or cancelled	(1,526	)	$	51.14	(1,200	)	$	78.32
Outstanding — December 31, 2015	118,838		$	43.29	43,050		$	78.32
Shares granted (a)	10,047		$	68.25	54,364		$	73.82
Shares vested	(110,749	)	$	42.96	—		$	—
Performance Shares vested	62,874		$	53.63	(43,050	)	$	78.32
Shares expired or cancelled	(291	)	$	40.65	(858	)	$	75.98
Outstanding — December 31, 2016 (b)	80,719		$	54.91	53,506		$	73.79

______________________________________________________________________

(a) For the years ended December 31, 2016, 2015 and 2014, includes 312 RSUs, 495 RSUs and 622 RSUs, respectively, that were granted in lieu of cash dividends. Such dividends-in-kind vest concurrently with the underlying RSUs.

(b) The aggregate pre-tax intrinsic value of outstanding RSUs as of December 31, 2016 was $6.9 million.