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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