Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013 segment	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 segment	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]
Number of operating segments				2					3
Summary of financial information of segments
Revenues	$ 500.1	$ 480.2	$ 485.1	$ 495.2	$ 487.0	$ 464.0	$ 465.5	$ 475.9		$ 1,960.6	$ 1,892.4	$ 1,744.0
Out-of-pocket reimbursements	167.2	171.6	172.0	187.2	171.6	168.0	167.3	177.3		698.0	684.2	644.7
Total revenues	667.3	651.8	657.1	682.4	658.6	632.0	632.8	653.2		2,658.6	2,576.6	2,388.7
Costs and expenses	544.8	531.4	551.3	574.6	559.8	544.4	539.6	559.1		2,202.1	2,202.9	1,997.0
Depreciation and amortization (including goodwill impairment)	42.9	34.1	33.1	33.2	99.6	40.5	42.3	34.0		143.3	216.4	131.6
Income (loss) from operations	79.6	86.3	72.7	74.6	(0.8)	47.1	50.9	60.1		313.2	157.3	260.1
Other income (expense), net	68.2	73.4	28.4	73.2	77.2	72.4	194.2	29.7		243.2	373.5	38.7
Equity in earnings (losses) of unconsolidated affiliates	4.1	3.8	9.5	5.6	22.4	3.1	1.4	5.3		23.0	32.2	21.7
Earnings (loss) before interest, income taxes and non-controlling interest										579.4	563.0	320.5
Interest expenses	7.2	8.4	9.3	9.6	9.5	10.6	11.7	11.7		34.5	43.5	46.5
Assets	3,090.5				3,392.5				3,090.5	3,090.5	3,392.5
Operating
Summary of financial information of segments
Revenues										1,960.6	1,892.4	1,744.0
Operating | Financial services
Summary of financial information of segments
Revenues										959.7	935.0	858.8
Out-of-pocket reimbursements										44.4	49.7	36.8
Total revenues										1,048.7	1,028.3	936.0
Costs and expenses										772.8	777.0	657.2
Depreciation and amortization (including goodwill impairment)										65.1	74.3	56.9
Income (loss) from operations										210.8	177.0	221.9
Other income (expense), net										3.3	8.1	8.0
Equity in earnings (losses) of unconsolidated affiliates										16.8	27.6	22.0
Earnings (loss) before interest, income taxes and non-controlling interest										230.9	212.7	251.9
Assets	1,422.5				1,589.0				1,422.5	1,422.5	1,589.0
Operating | Healthcare Services
Summary of financial information of segments
Revenues										333.3	300.6	270.8
Out-of-pocket reimbursements										6.2	5.1	5.3
Total revenues										339.5	305.7	276.1
Costs and expenses										270.5	255.9	240.5
Depreciation and amortization (including goodwill impairment)										19.3	17.7	19.6
Income (loss) from operations										49.7	32.1	16.0
Other income (expense), net										0.3	0.3	(1.4)
Equity in earnings (losses) of unconsolidated affiliates										0.4	0.3	0
Earnings (loss) before interest, income taxes and non-controlling interest										50.4	32.7	14.6
Assets	336.6				382.1				336.6	336.6	382.1
Operating | Customer communications
Summary of financial information of segments
Revenues										652.9	642.0	602.1
Out-of-pocket reimbursements										654.7	636.7	607.0
Total revenues										1,315.2	1,286.7	1,216.8
Costs and expenses										1,220.2	1,214.9	1,148.9
Depreciation and amortization (including goodwill impairment)										44.0	107.4	46.7
Income (loss) from operations										51.0	(35.6)	21.2
Other income (expense), net										0.2	0.1	0.1
Equity in earnings (losses) of unconsolidated affiliates										0.3	0.5	0.6
Earnings (loss) before interest, income taxes and non-controlling interest										51.5	(35.0)	21.9
Assets	403.0				385.5				403.0	403.0	385.5
Operating | Investments/Other
Summary of financial information of segments
Revenues										14.7	14.8	12.3
Out-of-pocket reimbursements										0.1	0.3	1.6
Total revenues										57.3	59.2	57.9
Costs and expenses										30.0	47.9	38.0
Depreciation and amortization (including goodwill impairment)										17.5	19.6	11.0
Income (loss) from operations										9.8	(8.3)	8.9
Other income (expense), net										239.4	365.0	32.0
Equity in earnings (losses) of unconsolidated affiliates										5.5	3.8	(0.9)
Earnings (loss) before interest, income taxes and non-controlling interest										254.7	360.5	40.0
Assets	991.8				1,102.3				991.8	991.8	1,102.3
Intersegment Operating/Elimination/Adjustments
Summary of financial information of segments
Revenues										(94.7)	(95.7)	(92.1)
Out-of-pocket reimbursements										(7.4)	(7.6)	(6.0)
Total revenues										(102.1)	(103.3)	(98.1)
Costs and expenses										(91.4)	(92.8)	(87.6)
Depreciation and amortization (including goodwill impairment)										(2.6)	(2.6)	(2.6)
Income (loss) from operations										(8.1)	(7.9)	(7.9)
Other income (expense), net										0
Earnings (loss) before interest, income taxes and non-controlling interest										(8.1)	(7.9)	(7.9)
Assets	(63.4)				(66.4)				(63.4)	(63.4)	(66.4)
Intersegment Operating/Elimination/Adjustments | Financial services
Summary of financial information of segments
Revenues										44.6	43.6	40.4
Intersegment Operating/Elimination/Adjustments | Healthcare Services
Summary of financial information of segments
Revenues										0	0	0
Intersegment Operating/Elimination/Adjustments | Customer communications
Summary of financial information of segments
Revenues										7.6	8.0	7.7
Intersegment Operating/Elimination/Adjustments | Investments/Other
Summary of financial information of segments
Revenues										$ 42.5	$ 44.1	$ 44.0