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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [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
2018
 
2017
 
2018
 
2017
Service cost
$
1.7

 
$
2.1

 
$
—

 
$
—

Interest cost
11.4

 
11.4

 
0.1

 
0.2

Expected return on plan assets
(15.8
)
 
(19.9
)
 
—

 
—

Amortization of prior service cost (credit)
0.1

 
0.2

 
—

 
—

Recognized net actuarial and other (gain) loss
4.1

 
4.0

 
(0.2
)
 
(0.3
)
Recognized loss due to settlement (1)
0.9

 
—

 
—

 
—

Net periodic benefit cost (income)
$
2.4

 
$
(2.2
)
 
$
(0.1
)
 
$
(0.1
)