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12. Commitments & Contingent Liabilities Net Periodic Benefit Cost (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs [Table Text Block] Components of Net Periodic Benefit Cost
The following sets forth the net periodic benefit cost (income) for the periods indicated (in millions):

 
2017
2016
2015
Service costs
$6.5
$6.1
$5.3
Interest costs
1.1

1.4

1.4

Expected returns on plan assets
(1.1
)
(1.0
)
(1.2
)
Amortization of actuarial losses
1.4

1.7

0.8

Amortization of prior service costs
—

—

0.4

Settlements
1.2

0.4

—

 
 
 
 
Net periodic benefit costs
$9.1
$8.6
$6.7