- Buildings and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
ORIGINAL COST	$ 1,335.6
ACCUMULATED DEPRECIATION	871.0
NET BOOK VALUE	464.6	$ 466.6
Land and Improvements
Property, Plant and Equipment [Line Items]
ORIGINAL COST	15.3
ACCUMULATED DEPRECIATION	1.0
NET BOOK VALUE	14.3
Buildings
Property, Plant and Equipment [Line Items]
ORIGINAL COST	260.4
ACCUMULATED DEPRECIATION	144.1
NET BOOK VALUE	116.3
Equipment
Property, Plant and Equipment [Line Items]
ORIGINAL COST	590.5
ACCUMULATED DEPRECIATION	405.1
NET BOOK VALUE	185.4
Leasehold Improvements
Property, Plant and Equipment [Line Items]
ORIGINAL COST	389.4
ACCUMULATED DEPRECIATION	263.2
NET BOOK VALUE	126.2
Buildings Leased under Capital Leases
Property, Plant and Equipment [Line Items]
ORIGINAL COST	80.0
ACCUMULATED DEPRECIATION	57.6
NET BOOK VALUE	$ 22.4