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Retirement and Postretirement Benefits
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Retirement and Postretirement Benefits Retirement and Postretirement Benefits
Components of the net periodic cost for retirement and postretirement benefits for the three months ended June 30, 2021 and 2020 were as follows:
U.S.
Defined Benefit Plans		Non-U.S.
Defined Benefit Plans		Postretirement
Medical Benefits
(Amounts in millions) 202120202021202020212020
Service cost$5.8 $6.6 $1.9 $1.7 $— $— 
Interest cost2.9 3.7 1.4 1.6 0.1 0.2 
Expected return on plan assets(6.2)(6.1)(1.7)(1.2)— — 
Amortization of prior service cost0.1 0.1 0.1 — 0.1 — 
Amortization of unrecognized net loss (gain) 2.0 1.8 1.2 1.1 — — 
Net periodic cost recognized$4.6 $6.1 $2.9 $3.2 $0.2 $0.2 
Components of the net periodic cost for retirement and postretirement benefits for the six months ended June 30, 2021 and 2020 were as follows:

U.S.
Defined Benefit Plans		Non-U.S.
Defined Benefit Plans		Postretirement
Medical Benefits
(Amounts in millions) 202120202021202020212020
Service cost$12.6 $12.9 $3.7 $3.4 $— $— 
Interest cost6.0 7.5 2.8 3.2 0.2 0.3 
Expected return on plan assets(12.7)(12.8)(3.2)(2.4)— — 
Amortization of prior service cost0.1 0.1 0.2 0.1 0.1 0.1 
Amortization of unrecognized net loss (gain)3.9 3.5 2.3 2.1 — (0.1)
Net periodic cost recognized$9.9 $11.2 $5.8 $6.4 $0.3 $0.3 
The components of net periodic cost for retirement and postretirement benefits other than service costs are included in other income (expense), net in our condensed consolidated statements of income.