- Buildings and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
ORIGINAL COST	$ 1,467.4	$ 1,317.0
ACCUMULATED DEPRECIATION	984.1	888.8
NET BOOK VALUE	483.3	428.2
Land and Improvements
Property, Plant and Equipment [Line Items]
ORIGINAL COST	14.5	15.4
ACCUMULATED DEPRECIATION	0.5	1.1
NET BOOK VALUE	14.0	14.3
Buildings
Property, Plant and Equipment [Line Items]
ORIGINAL COST	305.8	245.7
ACCUMULATED DEPRECIATION	156.0	148.2
NET BOOK VALUE	149.8	97.5
Equipment
Property, Plant and Equipment [Line Items]
ORIGINAL COST	731.0	649.9
ACCUMULATED DEPRECIATION	521.5	457.6
NET BOOK VALUE	209.5	192.3
Leasehold Improvements
Property, Plant and Equipment [Line Items]
ORIGINAL COST	416.1	406.0
ACCUMULATED DEPRECIATION	306.1	281.9
NET BOOK VALUE	$ 110.0	$ 124.1