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12. Commitments & Contingent Liabilities Period Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Operating Leases, Future Minimum Payments, Due in Four Years $ 19.7    
Operating Leases, Future Minimum Payments, Due in Five Years 13.9    
Letters of Credit Outstanding, Amount 3.1    
Operating Leases, Rent Expense, Net 47.4 $ 43.6 $ 44.4
Contribution expense $ 15.9 $ 16.0 $ 15.1