Investments (Tables)

12 Months Ended

Dec. 31, 2013

Investments, Debt and Equity Securities [Abstract]

Schedule of investments

Investments are as follows (in millions):

	Carrying Value
	December 31, 2013		December 31, 2012
Available-for-sale securities:
State Street Corporation	$	515.5	$	436.3
Other available-for-sale securities	138.5		175.2
	654.0		611.5
Other:
Trading securities	44.3		46.8
Held-to-maturity	—		14.9
Cost method, private equity and other investments	183.0		248.9
	227.3		310.6
Total investments	$	881.3	$	922.1

Schedule of reconciliation of available-for-sale securities from book cost basis to market value

Certain information related to the Company's available-for-sale securities is as follows (in millions):

	December 31,
	2013			2012
Book cost basis	$	166.9		$	200.9
Gross unrealized gains	487.5			412.5
Gross unrealized losses	(0.4		)	(1.9		)
Market value	$	654.0		$	611.5

Schedule of fair value and gross unrealized losses of investments by length of time in a continuous loss position

The following table summarizes the fair value and gross unrealized losses of the Company's investments by the length of time that the securities have been in a continuous loss position, at December 31, 2013 and December 31, 2012 (in millions):

	Less than 12 months				Greater than 12 months				Total
	Fair Value		Unrealized losses		Fair Value		Unrealized losses		Fair Value		Unrealized losses
December 31, 2013
Common Stock	$	5.9	$	0.4	$	—	$	—	$	5.9	$	0.4
December 31, 2012
Common Stock	$	25.7	$	1.9	$	—	$	—	$	25.7	$	1.9