Equity (Details 5) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended			9 Months Ended		0 Months Ended				9 Months Ended
	Jan. 29, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Oct. 24, 2014 Subsequent Event	Sep. 30, 2014 One of DST's unconsolidated affiliates affiliate	Dec. 31, 2013 One of DST's unconsolidated affiliates affiliate	Mar. 23, 2014 Argyros Group	Sep. 30, 2014 Common Stock	Sep. 30, 2014 Additional Paid-in Capital	Sep. 30, 2014 Retained Earnings
Unconsolidated affiliates
Number of unconsolidated affiliates with an interest rate swap								1	1
Unconsolidated affiliate's interest rate swap liability, fair value								$ 47,300,000	$ 45,500,000
Equity method investments ownership percentage								50.00%	50.00%	22.00%
Proportionate share in unconsolidated affiliate's interest rate swap liability								23,700,000	22,800,000
Stock repurchases
Stock repurchase, authorized amount	250,000,000				200,000,000
Common stock repurchased (in shares)					1.0	2.6
Aggregate repurchase price of common stock					92,100,000	181,800,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		157.9			157.9
Shares outstanding		38.7			38.7	42.5				9.2
Secondary common stock offering					450,000,000
Number of shares repurchased and retired					2.4
Share repurchase, non-cash gain					(18,100,000)	0
Effect of retirement of shares											100,000	4,800,000	213,200,000
Share receipts and withholding amount from option exercise and restricted stock vesting					6,100,000	23,300,000
Cash dividends declared (in dollars per share)		$ 0.30					$ 0.30
Dividends, common stock					37,000,000
Payments of dividends		$ 11,800,000	$ 11,900,000	$ 12,600,000