Subsequent Event - Disposition of Benefits Administration and Business Process Outsourcing (Details) - Tempo Business - Subsequent Event $ in Millions	Feb. 09, 2017 USD ($) agreement
Subsequent Event [Line Items]
Number Of Commercial Agreements | agreement	2
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Subsequent Event [Line Items]
Purchase price	$ 4,300
Deferred consideration	$ 500
Deferred consideration payment installments	20.00%
Buyer required IRR to pay deferred consideration	15.00%
Sponsor required return on cash proceeds	225.00%
Customary transaction marketing period before close	15 days
Agreement termination fee due	$ 215