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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Pre-Tax Income (Loss) and Effective Income Tax Rates
Our expected income tax provision computed on pre-tax income (loss) at the weighted average tax rate has been calculated as the sum of the pre-tax income (loss) in each jurisdiction multiplied by that jurisdiction’s applicable statutory tax rate. For the three and six months ended June 30, 2018 and 2017, pre-tax income (loss) attributable to our operations and the operations’ effective tax rates were as follows:
 
 
 
For the Three Months Ended June 30,
(in millions)
 
2018
 
2017
 
 
Pre-Tax
Income (Loss)
 
Effective
Tax
Rate
 
Pre-Tax
Income (Loss)
 
Effective
Tax
Rate
Bermuda
 
$
(33.6
)
 
—
 %
 
$
25.3

 
—
%
United States
 
85.7

 
17.1
 %
 
34.7

 
23.3
%
United Kingdom
 
6.6

 
10.1
 %
 
(6.5
)
 
52.8
%
Belgium
 
(0.1
)
 
36.4
 %
 
0.1

 
36.6
%
Brazil
 
0.1

 
—
 %
 
0.6

 
—
%
United Arab Emirates
 
0.2

 
—
 %
 
(2.2
)
 
—
%
Ireland
 
(0.1
)
 
—
 %
 
—

(1) 
—
%
Italy
 
(1.1
)
 
—
 %
 
—

 
—
%
Malta
 
(0.6
)
 
(0.2
)%
 
0.5

 
—
%
Luxembourg
 
—

(1) 
—
 %
 
(1.7
)
 
—
%
Switzerland
 
—

(1) 
20.8
 %
 
—

(1) 
22.1
%
Pre-tax income
 
$
57.1

 
26.9
 %
 
$
50.8

 
9.4
%

 
 
For the Six Months Ended June 30,
(in millions)
 
2018
 
2017
 
 
Pre-Tax
Income (Loss)
 
Effective
Tax
Rate
 
Pre-Tax
Income (Loss)
 
Effective
Tax
Rate
Bermuda
 
$
(8.4
)
 
—
%
 
$
51.7

 
—
%
United States
 
79.5

 
16.6
%
 
58.7

 
24.8
%
United Kingdom
 
12.7

 
17.1
%
 
(12.0
)
 
32.3
%
Belgium
 
—

(1) 
—
%
 
0.1

 
36.2
%
Brazil
 
(1.3
)
 
—
%
 
(0.2
)
 
—
%
United Arab Emirates
 
0.4

 
—
%
 
(3.5
)
 
—
%
Ireland
 
(0.1
)
 
—
%
 
—

(1) 
—
%
Italy
 
(1.1
)
 
—
%
 
—

 
—
%
Malta
 
0.4

 
0.2
%
 
1.1

 
—
%
Luxembourg
 
—

(1) 
—
%
 
(2.4
)
 
—
%
Switzerland
 
—

(1) 
20.8
%
 
—

(1) 
20.8
%
Pre-tax income
 
$
82.1

 
18.9
%
 
$
93.5

 
11.5
%
(1) 
Pre-tax income for the respective year was less than $0.1 million.
Reconciliation of Difference Between Provision for Income Taxes and Expected Tax Provision at Weighted Average Tax Rate
A reconciliation of the difference between the provision for income taxes and the expected tax provision at the weighted average tax rate is as follows:
 
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
(in millions)
 
2018
 
2017
 
2018
 
2017
Income tax (benefit) provision at expected rate
 
$
18.8

 
$
10.8

 
$
18.4

 
$
18.0

Tax effect of:
 
 
 
 
 
 
 
 
Nontaxable investment income
 
(0.5
)
 
(1.1
)
 
(1.0
)
 
(2.4
)
Foreign exchange adjustments
 
—

 
(0.9
)
 
(0.2
)
 
(0.3
)
Withholding taxes
 
0.2

 
0.2

 
0.3

 
0.3

Change in valuation allowance
 
(0.7
)
 
(1.0
)
 
(3.4
)
 
(1.1
)
Other
 
(2.5
)
 
(3.2
)
 
1.4

 
(3.7
)
Income tax provision
 
$
15.3

 
$
4.8

 
$
15.5

 
$
10.8