Buildings and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Original Cost	$ 1,137.9
Accumulated Depreciation	691.0
Net Book Value	446.9	$ 444.3
Land Improvements
Property, Plant and Equipment [Line Items]
Original Cost	26.5
Accumulated Depreciation	0.7
Net Book Value	25.8
Buildings
Property, Plant and Equipment [Line Items]
Original Cost	239.2
Accumulated Depreciation	126.3
Net Book Value	112.9
Equipment
Property, Plant and Equipment [Line Items]
Original Cost	450.7
Accumulated Depreciation	289.3
Net Book Value	161.4
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Original Cost	341.5
Accumulated Depreciation	222.9
Net Book Value	118.6
Buildings Leased under Capital Leases
Property, Plant and Equipment [Line Items]
Original Cost	80.0
Accumulated Depreciation	51.8
Net Book Value	$ 28.2