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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Components of Period Benefit Costs
The components of periodic benefit costs for the Direct Plans for the three months ended March 31, 2017 and 2016 are as follows:
 
 
Three Months Ended
 
Three Months Ended
 
 
March 31, 2017
 
March 31, 2016
(in millions)
 
Pension Plans
 
Postretirement
Health and
Other Plans
 
Pension Plans
 
Postretirement
Health and
Other Plans
Interest cost of projected benefit obligations
 
$
1.3

 
$
0.1

 
$
2.2

 
$
0.1

Expected return on plan assets
 
(1.5
)
 
—

 
(1.6
)
 
—

Amortization of actuarial net loss
 
0.5

 
—

 
0.6

 
—

Net periodic benefit costs
 
$
0.3

 
$
0.1

 
$
1.2

 
$
0.1