Investments (Tables)

6 Months Ended

Jun. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Schedule of investments

Investments are as follows (in millions): 

	Carrying Value
	June 30, 2013		December 31, 2012
Available-for-sale securities:
State Street Corporation	$	559.5	$	436.3
Other available-for-sale securities	144.5		175.2
	704.0		611.5
Other:
Trading securities	51.8		46.8
Held-to-maturity			14.9
Cost method, private equity and other investments	235.0		248.9
	286.8		310.6
Total investments	$	990.8	$	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):

	June 30, 2013			December 31, 2012
Book cost basis	$	191.3		$	200.9
Gross unrealized gains	513.3			412.5
Gross unrealized losses	(0.6		)	(1.9		)
Market value	$	704.0		$	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 June 30, 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
June 30, 2013
Common Stock	$	13.8	$	0.6	$	$	$	13.8	$	0.6
December 31, 2012
Common Stock	$	25.7	$	1.9	$	$	$	25.7	$	1.9