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Share-Based Awards (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Arrangements with Employees and Nonemployees [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The activity related to the Company’s share options for the year ended December 31, 2016 was as follows:
 
 
Options
Outstanding at January 1, 2016
 
267,918

Exercised prior to March 18, 2016
 
(15,997
)
Settled in cash by the Company upon change in control
 
(251,921
)
Outstanding at December 31, 2016
 
—


The activity related to share options exercised for the years ended December 31, 2016, 2015 and 2014 was as follows: 
 
 
2016
 
2015
 
2014
Options exercised
 
15,997

 
142,429

 
225,329

Total intrinsic value of options exercised (in millions of U.S. dollars)
 
$
1.1

 
$
8.5

 
$
8.7

Proceeds from option exercises (in millions of U.S. dollars)
 
$
1.2

 
$
9.8

 
$
14.7
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, 2016 was as follows:
 
 
RSUs and PSUs
Outstanding at January 1, 2016
861,608

Performance based adjustment
76,889

Vested prior to March 18, 2016
(270,986
)
Converted to common shares and settled in cash by Exor upon change in control
(667,511
)
Outstanding at December 31, 2016
—
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, 2016 was as follows:
 
 
SSARs
Outstanding at January 1, 2016
991,724

Exercised prior to March 18, 2016
(12,294
)
Settled in cash by the Company upon change in control
(979,430
)
Outstanding at December 31, 2016
—
Schedule Of Share Based Payment Award Share Appreciation Rights Valuation Assumptions Table [Text Block]
The Company valued SSARs issued with a Black-Scholes valuation model and used the following assumptions for the years ended December 31, 2015 and 2014:
 
 
 
2015
 
2014
Expected life
 
6 years

 
6 years

Expected volatility
 
17.7
%
 
18.1
%
Risk-free interest rate
 
1.9
%
 
1.9
%
Dividend yield
 
2.2
%
 
2.2
%