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12. Commitments & Contingent Liabilities Pensions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 0.80% 0.90% 1.10%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 1.10% 0.80%  
Defined Benefit Plan, Benefit Obligation $ 137.3 $ 136.6 $ 122.7
Defined Benefit Plan, Service Cost 7.5 6.5 6.1
Defined Benefit Plan, Interest Cost 1.1 1.1 1.4
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 3.1 2.8  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (5.4) 3.3  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (3.1) (3.2)  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment (0.5) 1.1  
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits 0.0 (2.0)  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 0.0 (5.1)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) (2.0) 9.4  
Defined Benefit Plan, Plan Assets, Amount 66.9 61.7 58.8
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0.3 0.5  
Defined Benefit Plan, Plan Assets, Contributions by Employer 4.0 4.0  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 3.1 2.8  
Defined Benefit Plan, Plan Assets, Benefits Paid (1.5) (2.3)  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0.0 (5.1)  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) (0.7) 3.0  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (70.4) (74.9)  
Liability, Defined Benefit Plan, Current (1.1) (1.1)  
Liability, Defined Benefit Plan, Noncurrent (69.3) (73.8)  
Liability, Defined Benefit Plan (70.4) (74.9)  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (1.1) (1.1) (1.0)
Defined Benefit Plan, Amortization of Gain (Loss) 1.3 1.4 1.7
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0.1 0.0 0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0.0 1.2 0.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 8.9 $ 9.1 $ 8.6
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 1.80% 1.80%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 1.80% 1.90% 1.60%