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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Components Of Net Periodic Cost
he components of net periodic cost (benefit) are as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
1.2

 
$
1.2

 
$
2.4

 
$
2.3

Interest cost
7.2

 
8.2

 
14.4

 
16.4

Expected return on plan assets
(13.9
)
 
(14.5
)
 
(27.8
)
 
(28.9
)
Amortization of prior service cost
(0.1
)
 
(0.2
)
 
(0.2
)
 
(0.4
)
Amortization of net loss
3.5

 
2.9

 
7.0

 
5.8

Net periodic benefit
$
(2.1
)
 
$
(2.4
)
 
$
(4.2
)
 
$
(4.8
)