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Earnings per Ordinary Share (Tables)
 9 Months Ended
Sep. 30, 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 ordinary share for the three and nine months ended September 30, 2017 and 2016, respectively:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
($ in millions, except share and per share amounts)
 
 
 
 
 
 
 
 
Net (loss) income
$
(253.8
)
 
$
95.6

 
$
(81.5
)
 
$
274.9

Preference share dividends
(7.7
)
 
(9.5
)
 
(28.7
)
 
(28.4
)
Preference share redemption costs (1)
(5.6
)
 
—

 
(8.0
)
 
—

Net amount attributable to non-controlling interest
(0.6
)
 
0.2

 
(0.8
)
 
—

Basic and diluted net (loss) income available to ordinary shareholders
$
(267.7
)
 
$
86.3

 
$
(119.0
)
 
$
246.5

Ordinary shares:
 
 
 
 
 
 
 
Basic weighted average ordinary shares
59,759,730

 
60,225,705

 
59,862,540

 
60,588,307

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

 
1,351,313

 
—

 
1,455,133

Total diluted weighted average ordinary shares
59,759,730

 
61,577,018

 
59,862,540

 
62,043,440

(Loss) earnings per ordinary share:
 
 
 
 
 
 
 
Basic
$
(4.48
)
 
$
1.43

 
$
(1.99
)
 
$
4.07

Diluted (3)
$
(4.48
)
 
$
1.40

 
$
(1.99
)
 
$
3.97

 
(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% and 7.250% Perpetual Non-Cumulative Preference Shares, net of issuance costs, and the total 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 share units as described in Note 14.
(3) 
The basic and diluted number of ordinary shares for the three and nine months ended September 30, 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 October 25, 2017, the Company’s Board of Directors (the “Board of Directors”) declared the following quarterly dividends:
 
Dividend
 
Payable on:
 
Record Date:
Ordinary shares
$
0.24

 
November 28, 2017
 
November 10, 2017
5.95% preference shares
$
0.3719

 
January 1, 2018
 
December 15, 2017
5.625% preference shares
$
0.3516

 
January 1, 2018
 
December 15, 2017