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Restructuring - Summary of Restructuring Activities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Reserve [Roll Forward] |  |  |
Accrual as of beginning of period | $ 74.0 | $ 71.8 | $ 50.2
Charges | 70.9 | 63.6 | 81.1
Utilization, Cash | (45.6) | (56.7) | (53.6)
Utilization, Non-cash | (1.3) | (4.7) | (5.9)
Accrual as of end of period | 98.0 | 74.0 | 71.8
Employee termination benefits |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Accrual as of beginning of period | 69.4 | 66.5 | 45.1
Charges | 62.9 | 54.1 | 70.0
Utilization, Cash | (39.3) | (51.2) | (48.6)
Utilization, Non-cash | 0.0 | 0.0 | 0.0
Accrual as of end of period | 93.0 | 69.4 | 66.5
Asset impairments |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Accrual as of beginning of period | 0.0 | 0.0 | 0.0
Charges | 1.3 | 4.7 | 3.9
Utilization, Cash | 0.0 | 0.0 | 0.0
Utilization, Non-cash | (1.3) | (4.7) | (3.9)
Accrual as of end of period | 0.0 | 0.0 | 0.0
Contract termination costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Accrual as of beginning of period | 4.6 | 5.3 | 5.1
Charges | 1.7 | 0.1 | 1.7
Utilization, Cash | (1.3) | (0.8) | (1.5)
Utilization, Non-cash | 0.0 | 0.0 | 0.0
Accrual as of end of period | 5.0 | 4.6 | 5.3
Other related costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Accrual as of beginning of period | 0.0 | 0.0 | 0.0
Charges | 5.0 | 4.7 | 5.5
Utilization, Cash | (5.0) | (4.7) | (3.5)
Utilization, Non-cash | 0.0 | 0.0 | (2.0)
Accrual as of end of period | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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