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Discontinued Operations - Summary of Assets and Liabilities of Discontinued Operations (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
LifeWorks [Member] |  |
Assets: |  |
Cash and equivalents | $ 5.3 | $ 10.6
Trade and other receivables, net | 13.3 | 7.0
Prepaid expenses | 1.5 | 1.7
Property, plant and equipment, net | 1.8 | 2.4
Other intangible assets, net | 5.9 | 9.2
Goodwill | 126.3 | 124.9
Other assets | 2.1 | 0.2
Assets of discontinued operations | 156.2 | 156.0
Liabilities: |  |
Accounts payable | 4.4 | 5.7
Other liabilities | 10.8 | 10.4
Liabilities of discontinued operations | 19.3 | 19.1
Deferred revenue | 2.8 | 1.9
Employee compensation and benefits | 1.3 | 1.1
Divested Benefits Continuation Businesses [Member] |  |
Assets: |  |
Other assets | 0.0 | 0.1
Assets of discontinued operations | 0.0 | 0.1
Liabilities: |  |
Accounts payable | 0.0 | 0.4
Other liabilities | 0.3 | 0.5
Liabilities of discontinued operations | 0.3 | $ 0.9
Previously Reported [Member] | LifeWorks [Member] |  |
Assets: |  |
Cash and equivalents | 5.4 |
Other assets | 2.0 |
Liabilities: |  |
Other liabilities | 10.9 |
Employee compensation and benefits | $ 1.2 |

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