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Earnings per Ordinary Share (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2018 and 2017, respectively:
 
Three Months Ended March 31,
 
2018
 
2017
 
($ in millions, except share and per share amounts)
 
 
 
 
Net income
$
30.8

 
$
96.5

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

 
(2.4
)
Net amount attributable to non-controlling interest
(0.2
)
 
(0.1
)
Basic and diluted net income available to ordinary shareholders
$
23.0

 
$
83.5

Ordinary shares:
 
 
 
Basic weighted average ordinary shares
59,546,165

 
59,862,662

Weighted average effect of dilutive securities (2)
966,982

 
1,334,110

Total diluted weighted average ordinary shares
60,513,147

 
61,196,772

Earnings per ordinary share:
 
 
 
Basic
$
0.39

 
$
1.39

Diluted (3)
$
0.38

 
$
1.36

 
(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) 
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 May 2, 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

 
June 5, 2018
 
May 18, 2018
5.95% preference shares
$
0.3719

 
July 1, 2018
 
June 15, 2018
5.625% preference shares
$
0.3516

 
July 1, 2018
 
June 15, 2018