Share-based compensation plans (Tables)

12 Months Ended

Dec. 31, 2018

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

Estimated fair values of all SARs applying assumptions

The Company computed the estimated fair values of all SARs using the Black-Scholes option-pricing model applying the assumptions set forth in the following table:

	2018		2017		2016
Expected dividend yield	3.1	%	2.7	%	3.5	%
Expected stock price volatility	16.2	%	17.2	%	18.5	%
Risk-free interest rate	2.8	%	2.0	%	1.3	%
Expected life of SARs	6 years		6 years		6 years

Company's SARs

The activity related to the Company’s SARs is as follows: 

	Nonvested	Vested	Total	Weighted- average Exercise Price
Outstanding, December 31, 2017	1,212,022	915,990	2,128,012	$	44.53
Vested	(434,023)	434,023	—
Granted	636,045	—	636,045	$	50.83
Exercised	—	(629,537)	(629,537)	$	40.61
Forfeited/Expired	(294,442)	(7,720)	(302,162)	$	48.51
Outstanding, December 31, 2018	1,119,602	712,756	1,832,358	$	47.41
Exercisable, December 31, 2018	—	712,756	712,756	$	46.65

Share-based compensation, performance shares award unvested activity

The activity related to performance contingent restricted stock units is as follows:

	Nonvested	Vested	Total	Average Grant Date Fair Value per Share
Outstanding, December 31, 2017	334,619	486,424	821,043	$37.12
Granted	133,226	—	133,226	$46.33
Performance adjustments	40,812	—	40,812	$57.21
Vested	(132,534)	132,534	—
Converted	—	(299,973)	(299,973)	$36.13
Cancelled	(46,591)	(6,080)	(52,671)	$44.37
Dividend equivalents	—	9,382	9,382	$52.88
Outstanding, December 31, 2018	329,532	322,287	651,819	$40.21

Activity related to PCSUs and restricted stock units

The activity related to restricted stock units is as follows:

	Nonvested	Vested	Total	Average Grant Date Fair Value Per Share
Outstanding, December 31, 2017	225,807	199,630	425,437	$	38.41
Granted	111,988	—	111,988	$	48.36
Vested	(141,281)	141,281	—
Converted	—	(196,915)	(196,915)	$	38.26
Cancelled	(39,301)	—	(39,301)	$	46.00
Dividend equivalents	1,168	7,418	8,586	$	52.37
Outstanding, December 31, 2018	158,381	151,414	309,795	$	41.26

Schedule of other share-based compensation, activity

The activity related to deferred compensation for equity award units granted to both employees and non-employee directors combined is as follows:

	Total
Outstanding, December 31, 2017	365,048
Deferred	37,127
Converted	(23,217)
Dividend equivalents	11,396
Outstanding, December 31, 2018	390,354