Discontinued Operations (Details 2) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Apr. 29, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax		$ (11.7)	$ 222.8	$ 18.7	$ 18.5	$ 12.8	$ 9.0	$ 12.0	$ 14.7	$ 248.3	$ 48.5	$ 32.5
Customer Communications | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues										389.0	608.0	596.5
Out-of-pocket reimbursements										409.0	743.1	648.0
Total revenue										798.0	1,351.1	1,244.5
Costs and expense										747.6	1,247.3	1,160.3
Depreciation and amortization (including goodwill)										28.9	30.9	38.0
Operating income										21.5	72.9	46.2
Interest expense										0.0	(0.3)	(0.3)
Other income, net										0.0	0.0	0.4
Equity in earnings of unconsolidated affiliates										0.3	0.4	0.7
Net gain on business disposition										341.5	0.0	0.0
Income before income taxes										363.3	73.0	47.0
Income taxes										115.0	24.5	14.5
Income from discontinued operations, net of tax										248.3	$ 48.5	$ 32.5
Disposal Group, Including Discontinued Operation, Impairment Charge										$ 17.0
United Kingdom | Customer Communications
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale Leaseback Transaction, Net Proceeds, Investing Activities	$ 16.0
Sale Leaseback Transaction, Lease Terms	P12Y
Sale Leaseback Transaction, Annual Rental Payments	$ 0.7