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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of net annual benefit cost (income)
The following table summarizes the components of net annual benefit cost (income):
(in Millions)
Three Months Ended March 31
Pensions
 
Other Benefits
2017
 
2016
 
2017
 
2016
Service cost
$
2.1

 
$
2.4

 
$
—

 
$
—

Interest cost
11.4

 
12.4

 
0.2

 
0.2

Expected return on plan assets
(19.9
)
 
(21.4
)
 
—

 
—

Amortization of prior service cost (credit)
0.2

 
0.2

 
—

 
—

Recognized net actuarial and other (gain) loss
4.0

 
10.3

 
(0.3
)
 
(0.3
)
Net periodic benefit cost
$
(2.2
)
 
$
3.9

 
$
(0.1
)
 
$
(0.1
)