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Pensions and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Components of net periodic benefit cost for the three and six months ended June 30, 2020 and 2019 were as follows:
Pension and Other Postretirement Benefits
Three Months EndedSix Months Ended
June 30,June 30,
(In millions)2020201920202019
Service cost$5.3  $5.3  $10.6  $10.6  
Interest cost2.9  3.9  5.8  7.7  
Expected return on plan assets(3.4) (3.1) (6.8) (6.1) 
Amortization of prior service costs—  0.2  —  0.5  
Recognized net actuarial losses (gains)0.1  (0.2) 0.3  (0.4) 
Net periodic benefit cost$4.9  $6.1  $9.9  $12.3