Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Consolidated long-lived assets	$ 993.9	$ 1,018.8	$ 1,134.0
U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Consolidated long-lived assets	720.6	732.7	790.1
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Consolidated long-lived assets	$ 273.3	$ 286.1	$ 343.9