Goodwill and Other Intangible Assets, Net - Summary of Goodwill Activity (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Line Items]
Net Book Value, Beginning balance	$ 10,560.1
Other Adjustments	(911.4)
Foreign Exchange	23.7
Gross Carrying Amount	10,532.5
Accumulated Impairment Charges	(860.1)
Net Book Value, Ending balance	9,672.4
Live [Member] | Operating Segments [Member]
Goodwill [Line Items]
Net Book Value, Beginning balance	3,910.8
Other Adjustments	(104.7)
Foreign Exchange	8.8
Gross Carrying Amount	4,239.8
Accumulated Impairment Charges	(424.9)
Net Book Value, Ending balance	3,814.9
Learn [Member] | Operating Segments [Member]
Goodwill [Line Items]
Net Book Value, Beginning balance	2,854.2
Foreign Exchange	13.2
Gross Carrying Amount	3,302.6
Accumulated Impairment Charges	(435.2)
Net Book Value, Ending balance	2,867.4
Work [Member] | Operating Segments [Member]
Goodwill [Line Items]
Net Book Value, Beginning balance	1,881.8
Other Adjustments	(624.4)
Foreign Exchange	(1.8)
Gross Carrying Amount	1,255.6
Net Book Value, Ending balance	1,255.6
Play [Member] | Operating Segments [Member]
Goodwill [Line Items]
Net Book Value, Beginning balance	1,159.3
Other Adjustments	(115.7)
Foreign Exchange	2.5
Gross Carrying Amount	1,046.1
Net Book Value, Ending balance	1,046.1
Other [Member] | Operating Segments [Member]
Goodwill [Line Items]
Net Book Value, Beginning balance	754.0
Other Adjustments	(66.6)
Foreign Exchange	1.0
Gross Carrying Amount	688.4
Net Book Value, Ending balance	$ 688.4