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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Pension Plan [Member]  
Schedule of Net Benefit Costs [Table Text Block]
Components of pension cost and other amounts recognized in other comprehensive income for the Company’s defined benefit plans are as follows:

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
  
2017
2016
 
2017
2016
Service cost

$1.4


$1.6

 

$4.1


$4.8

Interest cost on projected benefit obligation
1.8

2.1

 
5.5

6.4

Expected return on plan assets
(2.4
)
(2.6
)
 
(7.4
)
(7.6
)
Amortization and deferrals—net
1.7

1.7

 
4.6

5.2

Settlement charge
2.0

—

 
2.0

—

Total net pension cost

$4.5


$2.8

 

$8.8


$8.8
Other Pension Plan [Member]  
Schedule of Net Benefit Costs [Table Text Block]
Components of pension cost and other amounts recognized in other comprehensive income for the EDCP are as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
  
2017
2016
 
2017
2016
Service cost

$0.4


$0.3

 

$1.3


$0.9

Interest cost on projected benefit obligation
0.1

0.1

 
0.3

0.3

Total pension cost

$0.5


$0.4

 

$1.6


$1.2