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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Schedule of Net Funded Status

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 June 30,
 
Six Months Ended June 30,
  
2016
2015
 
2016
2015
Service cost
$
1.6

$
1.9

 
$
3.3

$
3.8

Interest cost on projected benefit obligation
2.2

2.7

 
4.4

5.4

Expected return on plan assets
(2.5
)
(2.6
)
 
(5.0
)
(5.2
)
Amortization and deferrals—net
1.7

2.7

 
3.4

5.4

Total pension cost
$
3.0

$
4.7

 
$
6.1

$
9.4
Other Pension Plan [Member]  
Schedule of Net Benefit Costs [Table Text Block]
Components of pension cost and other amounts recognized in other comprehensive loss for the EDCP are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
  
2016
2015
 
2016
2015
Service cost
$
0.3

$
0.4

 
$
0.6

$
0.8

Interest cost on projected benefit obligation
0.1

0.1

 
0.2

0.2

Total pension cost
$
0.4

$
0.5

 
$
0.8

$
1.0