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Earnings per Ordinary Share (Tables)
 6 Months Ended
Jun. 30, 2018
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 six months ended June 30, 2018 and 2017, respectively:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
($ in millions, except share and per share amounts)
 
 
 
 
 
 
 
 
Net (loss)/income
$
(14.7
)
 
$
75.8

 
$
16.1

 
$
172.3

Preference share dividends
(7.6
)
 
(10.5
)
 
(15.2
)
 
(21.0
)
Preference share redemption costs (1)
—

 
—

 
—

 
(2.4
)
Net amount attributable to non-controlling interest
(0.1
)
 
(0.1
)
 
(0.3
)
 
(0.2
)
Basic and diluted net (loss)/income available to ordinary shareholders (2)
$
(22.4
)
 
$
65.2

 
$
0.6

 
$
148.7

Ordinary shares:
 
 
 
 
 
 
 
Basic weighted average ordinary shares
59,671,684

 
59,966,358

 
59,609,271

 
59,914,797

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

 
1,056,623

 
918,865

 
1,181,020

Total diluted weighted average ordinary shares
59,671,684

 
61,022,981

 
60,528,136

 
61,095,817

(Loss)/earnings per ordinary share:
 
 
 
 
 
 
 
Basic
$
(0.38
)
 
$
1.09

 
$
0.01

 
$
2.48

Diluted (2)
$
(0.38
)
 
$
1.07

 
$
0.01

 
$
2.43

 
(1) 
The $2.4 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% Perpetual Non-Cumulative Preference Shares, net of issuance costs, and the final redemption costs of $133.2 million.
(2) 
The basic and diluted number of ordinary shares for the three months ended June 30, 2018 was the same, as the inclusion of dilutive securities in a loss-making period would be anti-dilutive.
(3) 
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.
Summary of Declared Dividends
Dividends. On August 1, 2018, the Company’s Board of Directors (the “Board of Directors”) declared the following quarterly dividends:
 
Dividend
 
Payable on:
 
Record Date:
Ordinary shares
$
0.24

 
September 4, 2018
 
August 17, 2018
5.95% preference shares
$
0.3719

 
October 1, 2018
 
September 15, 2018
5.625% preference shares
$
0.3516

 
October 1, 2018
 
September 15, 2018