Debt (Tables)

9 Months Ended

Sep. 30, 2014

Debt Instruments [Abstract]

Schedule of Debt [Table Text Block]

The carrying value of long-term debt at September 30, 2014 and December 31, 2013 consists of the following:

	September 30, 2014			December 31, 2013
Senior unsecured notes:
5.000%, due 2014	$	—		$	518.0
1.250%, due 2015	625.0			624.9
5.250%, due 2016	—			1,109.6
2.375%, due 2017	399.3			399.6
5.875%, due 2017	527.6			545.1
1.875%, due 2018	612.4			614.5
2.300%, due 2018	647.9			647.5
2.250%, due 2019	848.1			—
7.000%, due 2019	441.6			452.9
4.350%, due 2020	692.5			688.9
3.700%, due 2021	699.4			699.4
3.125%, due 2022	846.6			846.3
3.300%, due 2023	997.1			996.9
3.500%, due 2024	796.0			—
5.950%, due 2034	447.3			447.3
5.850%, due 2036	771.9			775.6
6.375%, due 2037	644.1			651.4
5.800%, due 2040	208.3			216.2
4.625%, due 2042	893.9			893.9
4.650%, due 2043	994.4			994.4
4.650%, due 2044	798.3			—
5.100%, due 2044	599.2			599.1
4.850%, due 2054	249.4			—
Senior convertible debentures:
2.750%, due 2042	972.3			966.0
Surplus notes:
9.000%, due 2027	24.9			24.9
Variable rate debt:
Commercial paper program	425.8			379.2
Total long-term debt	15,163.3			14,091.6
Current portion of long-term debt	(625.0		)	(518.0		)
Long-term debt, less current portion	$	14,538.3		$	13,573.6

Convertible Debenture Terms

The following table summarizes at September 30, 2014 the related balances, conversion rate and conversion price of the Debentures:

Outstanding principal amount	$	1,500.0
Unamortized debt discount	527.7
Net debt carrying amount	972.3
Equity component carrying amount	543.6
Conversion rate (shares of common stock per $1,000 of principal amount)	13.3489
Effective conversion price (per $1,000 of principal amount)	74.9117