Goodwill and Other Intangible Assets, Net - Summary of Goodwill Activity (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill [Line Items]
Beginning balance	$ 10,218.9
Acquisitions	172.8
Other Adjustments	15.5
Impairment	0.0
Foreign Currency	119.3
Ending balance	10,526.5
Live [Member] | Operating Segments [Member]
Goodwill [Line Items]
Beginning balance	3,639.9
Acquisitions	172.8
Other Adjustments	45.8
Impairment	0.0
Foreign Currency	25.3
Ending balance	3,883.8
Learn [Member] | Operating Segments [Member]
Goodwill [Line Items]
Beginning balance	2,785.4
Other Adjustments	3.9
Impairment	0.0
Foreign Currency	56.6
Ending balance	2,845.9
Work [Member] | Operating Segments [Member]
Goodwill [Line Items]
Beginning balance	1,871.0
Other Adjustments	(16.9)
Impairment	0.0
Foreign Currency	29.8
Ending balance	1,883.9
Play [Member] | Operating Segments [Member]
Goodwill [Line Items]
Beginning balance	1,161.4
Other Adjustments	(7.6)
Impairment	0.0
Foreign Currency	5.1
Ending balance	1,158.9
Other [Member] | Operating Segments [Member]
Goodwill [Line Items]
Beginning balance	761.2
Other Adjustments	(9.7)
Impairment	0.0
Foreign Currency	2.5
Ending balance	$ 754.0