Share-Based Awards (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Arrangements with Employees and Nonemployees [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The activity related to share options exercised for the years ended December 31, 2015, 2014 and 2013 was as follows:

	2015		2014		2013
Options exercised	142,429		225,329		819,764
Total intrinsic value of options exercised (in millions of U.S. dollars)	$	8.5	$	8.7	$	24.8
Proceeds from option exercises (in millions of U.S. dollars)	$	9.8	$	14.7	$	49.6

The activity related to the Company’s share options for the year ended December 31, 2015 was as follows:

	Options		Weighted  Average Exercise Price
Outstanding at January 1, 2015	410,347		$	71.55
Exercised	(142,429	)	70.47
Outstanding at December 31, 2015	267,918		$	72.13
Options exercisable at December 31, 2015	267,918		$	72.13
Options vested and expected to vest at December 31, 2015	267,918		$	72.13

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

The activity related to the Company’s RSUs and PSUs for the year ended December 31, 2015 was as follows:

	RSUs and PSUs
Outstanding at January 1, 2015	932,622
Granted	264,018
Performance based adjustment	10,142
Vested	(313,078	)
Forfeited	(32,096	)
Outstanding at December 31, 2015	861,608

Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]

The activity related to the Company’s SSARs for the year ended December 31, 2015 was as follows:

	SSARs
Outstanding at January 1, 2015	1,492,926
Granted	72,918
Exercised	(574,120	)
Outstanding at December 31, 2015	991,724
Exercisable at December 31, 2015	820,380

Schedule Of Share Based Payment Award Share Appreciation Rights Valuation Assumptions Table [Text Block]

The Company values SSARs issued with a Black-Scholes valuation model and used the following assumptions for the years ended December 31, 2015, 2014 and 2013:

	2015		2014		2013
Expected life	6 years		6 years		6 years
Expected volatility	17.7	%	18.1	%	18.3	%
Risk-free interest rate	1.9	%	1.9	%	1.0	%
Dividend yield	2.2	%	2.2	%	2.3	%