Fair Value Measurements (Narrative) (Details) (One of DST's unconsolidated affiliates, USD $) In Millions, unless otherwise specified	Mar. 31, 2014 affiliate	Dec. 31, 2013 affiliate
One of DST's unconsolidated affiliates
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Number of unconsolidated affiliates with an interest rate swap	1	1
Interest rate swap liability	$ 48.2	$ 45.5