Unconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 288.1				$ 403.0				$ 288.1	$ 403.0
Cash dividends from unconsolidated affiliates									129.4	4.5	7.2
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
Boston Financial Data Services, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%								50.00%
Carrying value	72.5				189.3				72.5	189.3
Cash dividends from unconsolidated affiliates									125.0
Equity in earnings (losses) of unconsolidated affiliates									8.2	10.2	9.9
International Financial Data Services
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%								50.00%
Carrying value	179.0				166.2				179.0	166.2
Equity in earnings (losses) of unconsolidated affiliates									9.7	21.9	15.7
Unconsolidated real estate affiliates
Schedule of Equity Method Investments [Line Items]
Carrying value	33.9				36.7				33.9	36.7
Other unconsolidated affiliates
Schedule of Equity Method Investments [Line Items]
Carrying value	2.7				10.8				2.7	10.8
Equity in earnings (losses) of unconsolidated affiliates									$ 5.1	$ 0.1	$ (3.9)
Pershing Road Development Company, LLC | Office space | U.S. government
Schedule of Equity Method Investments [Line Items]
Approximate square feet of office space	1,100,000								1,100,000