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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Components Of Net Periodic Cost
The components of net periodic cost are as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
Pension Benefits
 
Other
Postretirement
Benefits
 
Pension Benefits
 
Other
Postretirement
Benefits
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
1.4

 
$
1.3

 
$
—

 
$
—

 
$
4.0

 
$
3.8

 
$
—

 
$
0.1

Interest cost
9.5

 
10.2

 
0.1

 
0.1

 
28.6

 
30.7

 
0.3

 
0.3

Expected return on plan assets
(15.7
)
 
(15.7
)
 
—

 
—

 
(46.9
)
 
(47.1
)
 
—

 
—

Amortization of prior service cost
(0.1
)
 
—

 
(0.1
)
 
(0.1
)
 
(0.2
)
 
0.1

 
(0.2
)
 
(0.2
)
Amortization of net loss (gain)
3.1

 
1.3

 
—

 
—

 
9.3

 
3.8

 
(0.2
)
 
(0.1
)
Curtailment gain *
(4.4
)
 
—

 
—

 
—

 
(4.4
)
 
—

 
—

 
—

Net periodic cost
$
(6.2
)
 
$
(2.9
)
 
$
—

 
$
—

 
$
(9.6
)
 
$
(8.8
)
 
$
(0.1
)
 
$
—