Segments - Assets Allocated by Reportable Segments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets not allocated:
Cash and cash equivalents	$ 548.7	$ 262.4	$ 271.7	$ 594.0
Assets held for sale	0.3	2.8
Deferred taxes	187.1	238.6
Other	355.8	331.6
Total assets	6,083.8	5,765.2
Operating Segments
Assets allocated to segments:
Allocated segment assets	4,814.5	4,760.7
Operating Segments | Food
Assets allocated to segments:
Allocated segment assets	2,019.1	1,997.8
Operating Segments | Protective
Assets allocated to segments:
Allocated segment assets	2,795.4	2,762.9
Segment Reconciling Items
Assets not allocated:
Cash and cash equivalents	548.7	262.4
Assets held for sale	0.3	2.8
Income tax receivables	71.2	32.8
Other receivables	69.5	80.3
Deferred taxes	187.1	238.6
Other	392.5	387.6
Total assets	$ 6,083.8	$ 5,765.2