Convertible Securities (Tables)

3 Months Ended

Mar. 31, 2012

	December 31, 2011				March 31, 2012

	Carrying Value		Principal amount at maturity		Carrying Value		Principal amount at maturity
Senior convertible securities:
2008 senior convertible notes⁽¹⁾	$	435.6	$	460.0	$	439.2	$	460.0

Junior convertible trust preferred securities:
2007 junior convertible trust preferred securities⁽¹⁾	$	297.8	$	430.8	$	298.2	$	430.8
2006 junior convertible trust preferred securities⁽¹⁾		214.8		300.0		215.1		300.0

Total junior convertible securities	$	512.6	$	730.8	$	513.3	$	730.8

(1): Carrying value is accreted to the principal amount at maturity over an expected life of five years for the 2008 senior convertible notes and 30 years for each of the junior convertible trust preferred securities.

	2008 Senior Convertible Notes⁽¹⁾			2007 Junior Convertible Trust Preferred Securities⁽²⁾			2006 Junior Convertible Trust Preferred Securities⁽³⁾

Issue date		August 2008			October 2007			April 2006
Maturity date		August 2038			October 2037			April 2036
Next potential put date		August 2013			N/A			N/A
Denomination	$	1,000		$	50		$	50
Current conversion rate		7.959			0.250			0.333
Current conversion price	$	125.65		$	200.00		$	150.00
Stated coupon		3.95	%		5.15	%		5.10	%
Coupon frequency		Semi-annually			Quarterly			Quarterly
Tax deduction rate⁽⁴⁾		9.38	%		8.00	%		7.50	%

(1): The Company may redeem the notes for cash (subject to the holders' rights to convert) at any time on or after August 15, 2013. The holders may require the Company to repurchase the notes in August of 2013, 2018, 2023, 2028 and 2033.
(2): The Company may redeem the 2007 junior convertible trust preferred securities on or after October 15, 2012 if the closing price of the Company's common stock exceeds $260 per share for a specified period of time.
(3): The Company may redeem the 2006 junior convertible trust preferred securities if the closing price of the Company's common stock exceeds $195 per share for a specified period of time.

(4): These convertible securities are considered contingent payment debt instruments under federal income tax regulations, which require the Company to deduct interest in an amount greater than its reported Interest expense. These deductions will result in deferred tax liabilities of approximately $24.5 million in 2012. These deferred tax liabilities will be reclassified directly to stockholders' equity if the Company's common stock is trading above certain thresholds at the time of the conversion of the securities.