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12. Commitments & Contingent Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Post-Employment Benefits Liability $ 4.1 $ 3.5
Recorded Unconditional Purchase Obligation 134.0  
Recorded Unconditional Purchase Obligation Due in Next Twelve Months 2.7  
Recorded Unconditional Purchase Obligation Due in Second Year 12.0  
Recorded Unconditional Purchase Obligation Due in Third Year 7.3  
Recorded Unconditional Purchase Obligation Due in Fourth Year 5.6  
Recorded Unconditional Purchase Obligation Due in Fifth Year 3.8  
Recorded Unconditional Purchase Obligation Due after Fifth Year 102.6  
Unrecorded Unconditional Purchase Obligation 16.6  
Unrecorded Unconditional Purchase Obligation, Due in Twelve Months 14.1  
Unrecorded Unconditional Purchase Obligation, Due within Two Years 2.1  
Unrecorded Unconditional Purchase Obligation, Due within Three Years 0.1  
Unrecorded Unconditional Purchase Obligation, Due within Four Years 0.1  
Unrecorded Unconditional Purchase Obligation, Due within Five Years 0.1  
Unrecorded Unconditional Purchase Obligation, Due after Five Years 0.1  
Letters of Credit Outstanding Amount $ 4.9  
Employees Covered By Collective Bargaining Agreements U.S., Percentage 7.00%  
Defined Benefit Plan, Accumulated Benefit Obligation $ 159.5 138.6
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets $ 78.1 $ 66.3
UNITED STATES    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Entity Number of Employees 3,180