Debt (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

The Carrying Value Of Long-Term Debt

The carrying value of long-term debt at December 31 consists of the following:

	2013			2012
Senior unsecured notes:
6.000%, due 2014	$	—		$	399.8
5.000%, due 2014	518.0			535.9
1.250%, due 2015	624.9			624.8
5.250%, due 2016	1,109.6			1,114.0
2.375%, due 2017	399.6			401.5
5.875%, due 2017	545.1			697.4
1.875%, due 2018	614.5			625.2
2.300%, due 2018	647.5			—
7.500%, due 2019	—			556.9
7.000%, due 2019	452.9			599.3
4.350%, due 2020	688.9			701.0
3.700%, due 2021	699.4			699.3
3.125%, due 2022	846.3			845.9
3.300%, due 2023	996.9			996.7
5.950%, due 2034	447.3			498.8
5.850%, due 2036	775.6			895.7
6.375%, due 2037	651.4			796.7
5.800%, due 2040	216.2			296.8
4.625%, due 2042	893.9			893.7
4.650%, due 2043	994.4			994.2
5.100%, due 2044	599.1			—
Senior convertible debentures:
2.750%, due 2042	966.0			958.1
Surplus notes:
9.000%, due 2027	24.9			25.0
Variable rate debt:
Commercial paper program	379.2			570.9
Capital leases	—			0.3
Total long-term debt	14,091.6			14,727.9
Current portion of long-term debt	(518.0		)	(557.1		)
Long-term debt, less current portion	$	13,573.6		$	14,170.8

Convertible Debenture Terms

The following table summarizes at December 31, 2013 the related balances, conversion rate and conversion price of the Debentures:

Outstanding principal amount	$	1,500.0
Unamortized debt discount	534.0
Net debt carrying amount	966.0
Equity component carrying amount	543.6
Conversion rate (shares of common stock per $1,000 of principal amount)	13.2917
Effective conversion price (per $1,000 of principal amount)	75.2345