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Pension and Post-retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit cost were as follows (in millions):
 
For the Three Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
Pension Benefits
 
Other Benefits
Service cost
$
1.1

 
$
1.2

 
$
—

 
$
—

Interest cost
3.8

 
4.3

 
—

 
0.1

Expected return on plan assets
(5.4
)
 
(5.3
)
 
—

 
—

Amortization of prior service cost
0.1

 
—

 
(0.8
)
 
(0.8
)
Recognized actuarial loss
1.9

 
2.4

 
0.4

 
0.4

Settlements and curtailments
0.2

 
—

 
—

 
—

Net periodic benefit cost (1)
$
1.7


$
2.6

 
$
(0.4
)
 
$
(0.3
)

 
For the Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
Pension Benefits
 
Other Benefits
Service cost
$
3.3

 
$
3.6

 
$
—

 
$
—

Interest cost
11.5

 
12.9

 
0.1

 
0.2

Expected return on plan assets
(16.2
)
 
(16.0
)
 
—

 
—

Amortization of prior service cost
0.2

 
—

 
(2.3
)
 
(2.4
)
Recognized actuarial loss
5.7

 
7.2

 
1.1

 
1.2

Settlements and curtailments
0.2

 
0.4

 
—

 
—

Net periodic benefit cost (1)
$
4.7

 
$
8.1

 
$
(1.1
)
 
$
(1.0
)
(1) All net periodic benefit cost for the three and nine months ended September 30, 2016 and 2015 related to continuing operations.