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Pensions and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2020
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 June 30,Six Months Ended June 30,
PensionsOther BenefitsPensionsOther Benefits
20202019202020192020201920202019
Service cost$1.3  $1.4  $—  $—  $2.2  $2.5  $—  $—  
Interest cost9.2  12.1  0.1  0.2  18.3  24.3  0.2  0.4  
Expected return on plan assets(9.3) (13.4) —  —  (18.6) (26.8) —  —  
Amortization of prior service cost (credit)—  —  —  —  0.1  0.1  —  —  
Recognized net actuarial and other (gain) loss2.4  4.6  (0.2) (0.2) 4.9  9.2  (0.4) (0.4) 
Net periodic benefit cost (income)$3.6  $4.7  $(0.1) $—  $6.9  $9.3  $(0.2) $—