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Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Assets [Abstract]    
Capitalized software costs, net of accumulated amortization $ 7.4 $ 4.4
Business tax credits, including VAT and ICMS (net of $10.6 million and $11.5 million reserve as of December 31, 2017 and 2016, respectively) 2.4 2.5
Grantor trust assets 12.2 10.3
Other assets 5.9 4.3
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 4.6 0.0
Inventory, Noncurrent 7.0 6.0
Additional Information    
Reserve for losses on business tax credits 10.6 11.5
Total $ 39.5 $ 27.5