Investments (Tables)

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Schedule of investments

Investments are as follows (in millions): 

	Carrying Value
	March 31, 2014		December 31, 2013
Available-for-sale securities:
State Street Corporation	$	446.8	$	515.5
Other available-for-sale securities	135.0		138.5
	581.8		654.0
Other:
Trading securities	29.9		44.3
Cost method and other investments	166.3		183.0
	196.2		227.3
Total investments	$	778.0	$	881.3

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):

	March 31, 2014			December 31, 2013
Book cost basis	$	162.3		$	166.9
Gross unrealized gains	420.1			487.5
Gross unrealized losses	(0.6		)	(0.4		)
Market value	$	581.8		$	654.0

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 March 31, 2014 and December 31, 2013 (in millions):

	Less than 12 months				Greater than 12 months				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
March 31, 2014
Common stock	$	13.9	$	0.6	$	—	$	—	$	13.9	$	0.6
December 31, 2013
Common stock	$	5.9	$	0.4	$	—	$	—	$	5.9	$	0.4