Segment Reporting (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
American Express [Member]
Revenue, Major Customer [Line Items]
Concentration of sales by customer	10.00%	10.00%	10.00%
Total consolidated revenue from customer	$ 170.8	$ 127.7	$ 89.6
Percent of total consolidated revenues from customer	27.00%	24.00%	21.00%
Accounts receivable from customer	19.1	15.6	4.2
State Street Bank [Member]
Revenue, Major Customer [Line Items]
Concentration of sales by customer	10.00%	10.00%	10.00%
Total consolidated revenue from customer	109.4	87.3	82.6
Percent of total consolidated revenues from customer	17.00%	16.00%	20.00%
Accounts receivable from customer	$ 13.7	$ 11.5	$ 9.4
State Street Bank [Member] | Applications Outsourcing [Member]
Revenue, Major Customer [Line Items]
Percent of total consolidated revenues from customer	25.00%
State Street Bank [Member] | KPO [Member]
Revenue, Major Customer [Line Items]
Concentration of sales by customer	14.00%	14.00%	17.00%
Percent of total consolidated revenues from customer	75.00%