Share-Based Awards (Tables)

12 Months Ended

Dec. 31, 2014

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 granted and exercised for the years ended December 31, 2014, 2013 and 2012 was as follows:

	2014		2013		2012
Options granted	—		—		120,210
Weighted average grant date fair value of options granted	$	—	$	—	$	7.90
Options exercised	225,329		819,764		518,548
Total intrinsic value of options exercised (in millions of U.S. dollars)	$	8.7	$	24.8	$	8.8
Proceeds from option exercises (in millions of U.S. dollars)	$	14.7	$	49.6	$	29.3

The activity related to the Company’s share options for the year ended December 31, 2014 was as follows:

	Options		Weighted  Average Exercise Price
Outstanding at January 1, 2014	636,279		$	70.28
Granted	—		—
Exercised	(225,329	)	67.87
Forfeited or expired	(603	)	108.20
Outstanding at December 31, 2014	410,347		$	71.55
Options exercisable at December 31, 2014	379,799		$	71.62
Options vested and expected to vest at December 31, 2014	409,841		$	71.55

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The Company values share options issued with a Black-Scholes valuation model and used the following assumptions for the year ended December 31, 2012. No share options were issued for the years ended December 31, 2014 and 2013.

	2012
Expected life	6 years
Expected volatility	17.7	%
Risk-free interest rate	1.0	%
Dividend yield	2.7	%

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, 2014 was as follows:

	RSUs and PSUs
Outstanding at January 1, 2014	854,898
Granted	333,358
Performance based adjustment	39,870
Released	(253,389	)
Forfeited	(42,115	)
Outstanding at December 31, 2014	932,622

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, 2014 was as follows:

	SSARs
Outstanding at January 1, 2014	1,621,815
Granted	153,797
Exercised	(270,392	)
Forfeited or expired	(12,294	)
Outstanding at December 31, 2014	1,492,926
Exercisable at December 31, 2014	1,147,579

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, 2014, 2013 and 2012:

	2014		2013		2012
Expected life	6 years		6 years		6 years
Expected volatility	18.1	%	18.3	%	17.6	%
Risk-free interest rate	1.9	%	1.0	%	1.1	%
Dividend yield	2.2	%	2.3	%	2.8	%