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Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Capitalized software costs, net of accumulated amortization $ 8.3 $ 7.4
Business tax credits, including VAT and ICMS (net of $11.5 million and $10.6 million reserve as of December 31, 2018 and 2017, respectively) 1.2 2.4
Grantor trust assets 10.9 12.2
Net pension assets 0.8 4.6
Long-term supplies inventory 6.8 7.0
Other assets 5.9 5.9
Total 33.9 39.5
Reserve for losses on business tax credits $ 11.5 $ 10.6