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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
(in millions)
2016
 
2015
Service cost
$
1.2

 
$
1.4

Interest cost
8.2

 
9.6

Expected return on plan assets
(14.5
)
 
(15.6
)
Amortization of prior service cost
(0.2
)
 
—

Amortization of net loss (gain)
2.9

 
3.1

Net periodic cost
$
(2.4
)
 
$
(1.5
)