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Earnings per Ordinary Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Share
The following table sets forth the computation of basic and diluted earnings per share for the twelve months ended December 31, 2017, 2016, and 2015, respectively:
 
 
Twelve Months Ended December 31,
 
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
 
 
 
Net (loss)/income
 
$
(266.4
)
 
$
203.4

 
$
323.1

Preference share dividends
 
(36.2
)
 
(41.8
)
 
(37.8
)
Preference share redemption costs (1)
 
(8.0
)
 
—

 
—

Net profit attributable to non-controlling interest
 
(1.3
)
 
(0.1
)
 
(0.8
)
Basic and diluted net income available to ordinary shareholders
 
$
(311.9
)
 
$
161.5

 
$
284.5

Ordinary shares:
 
 
 
 
 
 
Basic weighted average ordinary shares
 
59,753,886

 
60,478,740

 
61,287,884

Weighted average effect of dilutive securities (2) (3)
 
—

 
1,381,949

 
1,399,619

Total diluted weighted average ordinary shares
 
59,753,886

 
61,860,689

 
62,687,503

Earnings per ordinary share:
 

 
 
 
 
Basic
 
$
(5.22
)
 
$
2.67

 
$
4.64

Diluted (3)
 
$
(5.22
)
 
$
2.61

 
$
4.54

 _______________
(1) 
The $8.0 million deduction from net income in 2017 is attributable to the reclassification from additional paid-in capital to retained earnings representing the difference between the capital raised upon issuance of the 7.401% Preference Shares and 7.250% Preference Shares, net of issuance costs, and the final redemption costs of $293.2 million.
(2) 
Dilutive securities consist of employee restricted share units and performance shares associated with the Company’s long term incentive plan, employee share purchase plans and director restricted stock units and options as described in Note 17.
(3) 
The basic and diluted number of ordinary shares for 2017 is the same, as the inclusion of dilutive securities in a loss making period would be anti-dilutive.
Summary of Declared Dividends
Dividends. On February 7, 2018, the Company’s Board of Directors declared the following quarterly dividends:
 
 
Dividend
 
Payable on:
 
Record Date:
Ordinary shares
 
$
0.24

 
March 13, 2018
 
February 23, 2018
5.95% Preference Shares
 
$
0.3719

 
April 1, 2018
 
March 15, 2018
5.625% Preference Shares
 
$
0.3516

 
April 1, 2018
 
March 15, 2018