- Buildings and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
ORIGINAL COST	$ 1,317.0
ACCUMULATED DEPRECIATION	888.8
NET BOOK VALUE	428.2	$ 464.6
Land and Improvements
Property, Plant and Equipment [Line Items]
ORIGINAL COST	15.4
ACCUMULATED DEPRECIATION	1.1
NET BOOK VALUE	14.3
Buildings
Property, Plant and Equipment [Line Items]
ORIGINAL COST	245.7
ACCUMULATED DEPRECIATION	148.2
NET BOOK VALUE	97.5
Equipment
Property, Plant and Equipment [Line Items]
ORIGINAL COST	649.9
ACCUMULATED DEPRECIATION	457.6
NET BOOK VALUE	192.3
Leasehold Improvements
Property, Plant and Equipment [Line Items]
ORIGINAL COST	406.0
ACCUMULATED DEPRECIATION	281.9
NET BOOK VALUE	$ 124.1