Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 segment	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting [Abstract]
Number of operating segments	2
Summary of financial information of segments
Assets	$ 3,417.3		$ 3,392.5
Operating revenues	495.2	475.9
Out-of-pocket reimbursements	187.2	177.3
Total revenues	682.4	653.2
Costs and expenses	574.6	559.1
Depreciation and amortization	33.2	34.0
Income from operations	74.6	60.1
Other income (loss), net	73.2	29.7
Equity in earnings of unconsolidated affiliates	5.6	5.3
Earnings (loss) before interest, income taxes and non-controlling interest	153.4	95.1
Interest expense	9.6	11.7
Financial Services
Summary of financial information of segments
Assets	1,927.0		1,971.1
Operating revenues	318.1	309.1
Intersegment operating revenues	2.2	2.0
Out-of-pocket reimbursements	13.3	14.5
Total revenues	333.6	325.6
Costs and expenses	258.6	252.5
Depreciation and amortization	20.5	21.0
Income from operations	54.5	52.1
Other income (loss), net	(4.4)	5.0
Equity in earnings of unconsolidated affiliates	3.6	4.5
Earnings (loss) before interest, income taxes and non-controlling interest	53.7	61.6
Customer Communications
Summary of financial information of segments
Assets	378.9		385.5
Operating revenues	173.2	163.4
Intersegment operating revenues	2.0	2.0
Out-of-pocket reimbursements	175.9	164.7
Total revenues	351.1	330.1
Costs and expenses	321.1	311.9
Depreciation and amortization	10.8	11.0
Income from operations	19.2	7.2
Other income (loss), net	(0.8)
Equity in earnings of unconsolidated affiliates	0.1	0.2
Earnings (loss) before interest, income taxes and non-controlling interest	18.5	7.4
Investments and Other
Summary of financial information of segments
Assets	1,177.0		1,102.3
Operating revenues	3.9	3.4
Intersegment operating revenues	10.3	11.0
Out-of-pocket reimbursements		0.1
Total revenues	14.2	14.5
Costs and expenses	8.8	9.0
Depreciation and amortization	2.5	2.7
Income from operations	2.9	2.8
Other income (loss), net	78.4	24.7
Equity in earnings of unconsolidated affiliates	1.9	0.6
Earnings (loss) before interest, income taxes and non-controlling interest	83.2	28.1
Elimination Adjustments
Summary of financial information of segments
Assets	(65.6)		(66.4)
Intersegment operating revenues	(14.5)	(15.0)
Out-of-pocket reimbursements	(2.0)	(2.0)
Total revenues	(16.5)	(17.0)
Costs and expenses	(13.9)	(14.3)
Depreciation and amortization	(0.6)	(0.7)
Income from operations	(2.0)	(2.0)
Earnings (loss) before interest, income taxes and non-controlling interest	$ (2.0)	$ (2.0)