Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Share-Based Compensation [Abstract]

Share-Based Compensation Options Outstanding Rollforward

	2013				2012				2011
				Weighted				Weighted				Weighted
				Average				Average				Average
		Number		Exercise		Number		Exercise		Number		Exercise
		of		Price		of		Price		of		Price
		Options		per Share		Options		per Share		Options		per Share
Options outstanding January 1,		2,253,510	$	76.14		2,591,066	$	74.30		2,950,892	$	69.43
Granted		235,000		153.89		35,000		144.97		135,000		120.77
Exercised		(286,299)		71.06		(341,156)		68.26		(448,826)		58.86
Cancelled		(28,000)		55.25		(31,400)		55.54		(46,000)		48.95
Options outstanding December 31,		2,174,211	$	85.49		2,253,510	$	76.14		2,591,066	$	74.30
Options exercisable at December 31,		1,581,954	$	76.29		1,401,883	$	76.23		1,200,356	$	76.94

Share-Based Compensation Valuation Assumptions

	2013		2012		2011
Stock option expense for the year
(in 000's)	$	3,468	$	3,036	$	3,445
Aggregate exercise date intrinsic value of
options exercised during the year
(in 000's)	$	23,337	$	23,948	$	23,703
Average assumptions used in valuing options with the Black-Scholes method:
Expected life of options in years, based upon historical experience		5		5		5
Risk-free interest rate		0.8%		0.8%		1.2%
Expected volatility, based upon historical volatility		25.8%		24.5%		18.8%
Expected dividend yield		3.3%		3.1%		3.3%
Average estimated value of options
granted during the year	$	23.83	$	20.71	$	13.01

Share-Based Compensation Restricted Units Outstanding And Vesting

	2013				2012				2011
		Number of		Grant Date		Number of		Grant Date		Number of		Grant Date
		Restricted		Aggregate		Restricted		Aggregate		Restricted		Aggregate
		Share Units		Fair Value		Share Units		Fair Value		Share Units		Fair Value
Restricted share units outstanding January 1,		642,647	$	67,473		701,499	$	66,514		484,395	$	39,896
Granted		197,675		30,774		159,133		21,721		381,025		40,570
Vested		(154,535)		(15,657)		(151,775)		(14,507)		(92,039)		(7,655)
Forfeited		(49,458)		(5,306)		(66,210)		(6,255)		(71,882)		(6,297)
Restricted share units outstanding December 31,		636,329	$	77,284		642,647	$	67,473		701,499	$	66,514

	2013		2012		2011
Amounts for the year (in 000's,
except number of shares:
Fair value of vested shares on vesting date	$	23,551	$	20,783	$	10,224
Cash paid upon vesting lieu of common shares issued	$	8,067	$	7,657	$	3,736
Common shares issued upon vesting		101,706		95,925		59,232
Restricted share unit expense	$	23,919	$	20,227	$	19,736