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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
(in millions)
2016
 
2015
 
2016
 
2015
Service cost
$
1.2

 
$
1.2

 
$
2.3

 
$
2.7

Interest cost
8.2

 
9.4

 
16.4

 
19.0

Expected return on plan assets
(14.5
)
 
(15.4
)
 
(28.9
)
 
(31.2
)
Amortization of prior service cost
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.1
)
Amortization of net loss (gain)
2.9

 
3.1

 
5.8

 
6.2

Net periodic cost
$
(2.4
)
 
$
(1.9
)
 
$
(4.8
)
 
$
(3.4
)