Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013 affiliate		Dec. 31, 2012 affiliate		Dec. 31, 2011 affiliate
One of DST's unconsolidated affiliates
Fair value measurements
Number of unconsolidated affiliates with an interest rate swap	1		1		1
Interest rate swap liability	$ 45.5		$ 73.5		$ 0
Fair value measured on a recurring basis | Money Market Funds [Member]
Fair value measurements
Investments	170.5	[1]	255.9	[1]
Fair value measured on a recurring basis | Estimated Fair Value
Fair value measurements
Deferred compensation liabilities	(44.3)	[2]	(43.8)	[2]
Derivative instruments	(0.8)	[2]	(2.3)	[2]
Total	836.1		927.8
Fair value measured on a recurring basis | Estimated Fair Value | Equity securities
Fair value measurements
Investments	698.0	[1]	651.7	[1]
Fair value measured on a recurring basis | Estimated Fair Value | Investments in pooled funds
Fair value measurements
Investments	12.4	[1]	47.9	[1]
Fair value measured on a recurring basis | Estimated Fair Value | Fixed income securities
Fair value measurements
Investments	0.3	[1]	18.4	[1]
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1)
Fair value measurements
Deferred compensation liabilities	(44.3)	[2]	(43.8)	[2]
Derivative instruments	0	[2]	0	[2]
Total	824.2		857.3
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1) | Money Market Funds [Member]
Fair value measurements
Investments	170.5	[1]	249.4	[1]
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1) | Equity securities
Fair value measurements
Investments	698.0	[1]	651.7	[1]
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1) | Investments in pooled funds
Fair value measurements
Investments	0	[1]	0	[1]
Fair value measured on a recurring basis | Quoted prices in Active Markets for Identical Assets (Level 1) | Fixed income securities
Fair value measurements
Investments	0	[1]	0	[1]
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2)
Fair value measurements
Deferred compensation liabilities	0	[2]	0	[2]
Derivative instruments	(0.8)	[2]	(2.3)	[2]
Total	11.9		70.5
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Money Market Funds [Member]
Fair value measurements
Investments	0	[1]	6.5	[1]
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities
Fair value measurements
Investments	0	[1]	0	[1]
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Investments in pooled funds
Fair value measurements
Investments	12.4	[1]	47.9	[1]
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Fixed income securities
Fair value measurements
Investments	0.3	[1]	18.4	[1]
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)
Fair value measurements
Deferred compensation liabilities	0	[2]	0	[2]
Derivative instruments	0	[2]	0	[2]
Total	0		0
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Money Market Funds [Member]
Fair value measurements
Investments	0	[1]	0	[1]
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Equity securities
Fair value measurements
Investments	0	[1]	0	[1]
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Investments in pooled funds
Fair value measurements
Investments	0	[1]	0	[1]
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Fixed income securities
Fair value measurements
Investments	$ 0	[1]	$ 0	[1]

[1] Included in Investments on the Company's Consolidated Balance Sheet.

[2] Included in Other liabilities on the Company's Consolidated Balance Sheet.