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Retirement and Other Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of Net Periodic Benefit Cost The components of net periodic (gain) benefit cost for the Company’s qualified pension benefits plan, nonqualified pension benefits plan and retirement health benefits plan for the three months ended March 31, 2017 and 2016 were as follows: 
 
Qualified Pension Benefits
 
Unfunded Nonqualified Pension
Benefits
 
Retirement Health
Benefits
 
For the Three Months Ended March 31,
 
For the Three Months Ended March 31,
 
For the Three Months Ended March 31,
 
2017 Plan 1
2017 Plan 2
 
2016 Plan 1
2016 Plan 2
 
2017
 
2016
 
2017
 
2016
Service cost
$
—

$
—

 
$
—

$
—

 
$
—

 
$
0.1

 
$
—

 
$
—

Interest cost
2.9

3.1

 
3.4

3.5

 
0.8

 
0.9

 
0.9

 
0.9

Expected return on plan assets
(6.1
)
(6.8
)
 
(7.8
)
(5.9
)
 
—

 
—

 
(0.8
)
 
(0.8
)
Amortization of net loss
—

0.3

 
—

0.3

 
0.3

 
0.3

 
—

 
—

Curtailment/settlement (gain)
—

—

 
(23.1
)
—

 
(0.7
)
 
(2.3
)
 
—

 
(4.2
)
Net periodic (gain) benefit cost
$
(3.2
)
$
(3.4
)
 
$
(27.5
)
$
(2.1
)
 
$
0.4

 
$
(1.0
)
 
$
0.1

 
$
(4.1
)