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12. Commitments & Contingent Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Post-Employment Benefits Liability $ 3.5 $ 3.1
Recorded Unconditional Purchase Obligation 118.4  
Recorded Unconditional Purchase Obligation Due in Next Twelve Months 5.2  
Recorded Unconditional Purchase Obligation Due in Second Year 12.8  
Recorded Unconditional Purchase Obligation Due in Third Year 4.5  
Recorded Unconditional Purchase Obligation Due in Fourth Year 4.3  
Recorded Unconditional Purchase Obligation Due in Fifth Year 3.3  
Recorded Unconditional Purchase Obligation Due after Fifth Year 88.3  
Unrecorded Unconditional Purchase Obligation 35.8  
Unrecorded Unconditional Purchase Obligation, Due in Twelve Months 34.0  
Unrecorded Unconditional Purchase Obligation, Due within Two Years 1.0  
Unrecorded Unconditional Purchase Obligation, Due within Three Years 0.2  
Unrecorded Unconditional Purchase Obligation, Due within Four Years 0.2  
Unrecorded Unconditional Purchase Obligation, Due within Five Years 0.2  
Unrecorded Unconditional Purchase Obligation, Due after Five Years 0.2  
Letters of Credit Outstanding Amount $ 4.2  
Employees Covered By Collective Bargaining Agreements U.S., Percentage 7.00%  
UNITED STATES    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Entity Number of Employees 3,180