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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components Of Net Periodic Cost
he components of net periodic cost are as follows:
 
Pension Benefits
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
2016
 
2015
 
2016
 
2015
Service cost
$
1.2

 
$
1.4

 
$
3.5

 
$
4.0

Interest cost
8.2

 
9.5

 
24.5

 
28.6

Expected return on plan assets
(14.5
)
 
(15.7
)
 
(43.3
)
 
(46.9
)
Amortization of prior service cost
(0.2
)
 
(0.1
)
 
(0.5
)
 
(0.2
)
Amortization of net loss (gain)
2.9

 
3.1

 
8.7

 
9.3

Curtailment gain
—

 
(4.4
)
 
—

 
(4.4
)
Net periodic cost
$
(2.4
)
 
$
(6.2
)
 
$
(7.1
)
 
$
(9.6
)