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Restructuring Costs - Schedule of Restructuring Costs Incurred by Reportable Business Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 111.9 | $ 74.9 | $ 77.2
Corporate [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 55.8 | 20.9 | 53.4
Live [Member] | Operating Segments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 14.0 | 18.8 | 3.6
Learn [Member] | Operating Segments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 10.1 | 14.0 | 9.3
Work [Member] | Operating Segments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 11.6 | 6.4 | 7.7
Play [Member] | Operating Segments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 14.3 | 6.7 | 0.3
Other [Member] | Operating Segments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 6.1 | $ 8.1 | $ 2.9

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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