Quarterly report pursuant to Section 13 or 15(d)

Detail of Certain Balance Sheet Accounts - Additional Information (Detail)

v3.10.0.1
Detail of Certain Balance Sheet Accounts - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Deferred compensation plan assets $ 34.5 $ 33.6
Deferred tax assets 72.0 77.5
Deferred compensation plan liabilities 57.1 58.1
Deferred income tax liabilities $ 7.3 $ 7.8