Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Capitalized software costs, net of accumulated amortization	$ 11.9	$ 8.3
Business tax credits, including VAT and ICMS (net of $12.1 million and $11.5 million reserve as of December 31, 2019 and 2018, respectively)	0.0	1.2
Grantor trust assets	14.7	10.9
Net pension assets	5.9	0.8
Long-term supplies inventory	6.9	6.8
Operating lease assets	20.9
Other assets	8.9	5.9
Total	69.2	33.9
Reserve for losses on business tax credits	$ 12.1	$ 11.5