Equity (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Components of accumulated other comprehensive income (loss)
Balance at beginning of the period	$ 256.8		$ 277.8
Net current period other comprehensive income (loss)	51.4		(21.0)		(73.5)
Balance at end of the period	308.2		256.8		277.8
Available-for-sale securities, Pretax
Unrealized gains (losses) on available-for-sale securities	267.6		122.3		(103.3)
Reclassification of gains into net earnings on available-for-sale securities	(191.6)	[1]	(145.7)	[1]	(18.0)	[1]
Net change in available-for-sale securities	76.0		(23.4)		(121.3)
Cash flow hedges, Pretax
Unrealized losses on cash flow hedges	(1.2)		(0.8)		0.7
Net change in cash flow hedges	1.7		2.0		0.7
Reclassification of losses into net earnings, Pretax	0	[2]	0	[2]	2.0	[2]
Cumulative translation adjustments, Pretax	3.4		(20.1)		(1.1)
Other comprehensive income (loss)	81.1		(41.5)		(119.7)
Available-for-sale securities, Net of Tax
Unrealized gains (losses) on available-for-sale securities	164.1		78.5		(63.1)
Reclassification of gains into net earnings on available-for-sale securities	(117.0)	[1]	(88.9)	[1]	(11.0)	[1]
Net change in available-for-sale securities	47.1		(10.4)		(74.1)
Cash flow hedges, Net of Tax
Proportional share of unconsolidated affiliates other comprehensive income	(1.0)		(0.5)		0.4
Net change in cash flow hedges	0.9		1.1		0.4
Reclassification of losses into net earnings, Net of Tax	0	[2]	0	[2]	1.2	[2]
Cumulative translation adjustments, Net of Tax	3.4		(11.7)		(1.0)
Other comprehensive income (loss)	51.4		(21.0)		(73.5)
Unrealized Gains on Available-for-Sale Securities
Components of accumulated other comprehensive income (loss)
Balance at beginning of the period	253.7		264.1
Net current period other comprehensive income (loss)	47.1		(10.4)
Balance at end of the period	300.8		253.7
Cash flow hedges, Net of Tax
Other comprehensive income (loss)	47.1		(10.4)
Unrealized Loss on Cash Flow Hedges
Components of accumulated other comprehensive income (loss)
Balance at beginning of the period	(1.4)		(2.5)
Net current period other comprehensive income (loss)	0.9		1.1
Balance at end of the period	(0.5)		(1.4)
Cash flow hedges, Net of Tax
Other comprehensive income (loss)	0.9		1.1
Foreign Currency Translation Adjustments
Components of accumulated other comprehensive income (loss)
Balance at beginning of the period	4.5		16.2
Net current period other comprehensive income (loss)	3.4		(11.7)
Balance at end of the period	7.9		4.5
Cash flow hedges, Net of Tax
Other comprehensive income (loss)	3.4		(11.7)
One of DST's unconsolidated affiliates
Number of unconsolidated affiliates with an interest rate swap	1
Unconsolidated affiliate's interest rate swap liability, fair value	45.5		73.5		73.0
Equity method investments ownership percentage	50.00%
Proportionate share in unconsolidated affiliate's interest rate swap liability	22.8		36.8		36.5
Foreign currency
Cash flow hedges, Pretax
Reclassification of losses into net earnings on cash flow hedges	0.4	[3]	0	[3]	0	[3]
Cash flow hedges, Net of Tax
Reclassification of losses into net earnings on cash flow hedges	0.4	[3]	0	[3]	0	[3]
Interest rate
Cash flow hedges, Pretax
Reclassification of losses into net earnings on cash flow hedges	2.5	[4]	2.8	[4]	0	[4]
Cash flow hedges, Net of Tax
Reclassification of losses into net earnings on cash flow hedges	$ 1.5	[4]	$ 1.6	[4]	$ 0	[4]

[1] Realized (gains)/losses on available for sale securities are recognized in Other income, net.

[2] Reclassification to net earnings of the Company's proportionate share of unconsolidated affiliates other comprehensive income are recognized in Equity in earnings.

[3] Reclassification to net earnings of derivatives qualifying as effective foreign currency cash flow hedges are recognized in Costs and expenses.

[4] Reclassification to net earnings of derivatives qualifying as effective interest rate cash flow hedges are recognized in Interest expense.