Detail of Certain Balance Sheet Accounts - Schedule of Other Current Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Current [Abstract]
Accrued compensation	$ 117.3	$ 125.8
Accrued service fees to China independent service providers	58.7	46.3
Accrued advertising, events, and promotion expenses	46.3	48.4
Advance sales deposits	65.2	50.1
Income taxes payable	25.7	42.0
Other accrued liabilities	145.7	142.2
Total	$ 458.9	$ 454.8