Impairment of Long-lived Assets (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Impairment of long-lived assets
Impairment loss of intangible assets	$ 35.6	$ 35.6
Impairment loss of property, plant and equipment	17.7	17.7
Total impairment loss of long-lived assets	$ 53.3	$ 53.3