Debt (Carrying Value Of Long-term Debt) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
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
Senior Unsecured Notes [Member] | Five Point Zero Zero Zero Percent Due Two Thousand Fourteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%
Long-term Debt	0	518.0
Senior Unsecured Notes [Member] | One Point Two Five Zero Percent Due Two Thousand Fifteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.25%	1.25%
Long-term Debt	625.0	624.9
Senior Unsecured Notes [Member] | Five Point Two Five Zero Percent Due Two Thousand Sixteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%	5.25%
Long-term Debt	0	1,109.6
Senior Unsecured Notes [Member] | Two Point Three Seven Five Percent Due Two Thousand And Seventeen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.375%	2.375%
Long-term Debt	399.3	399.6
Senior Unsecured Notes [Member] | Five Point Eight Seven Five Percent Due Two Thousand Seventeen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.875%	5.875%
Long-term Debt	527.6	545.1
Senior Unsecured Notes [Member] | One Point Eight Seven Five Percent Due Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.875%	1.875%
Long-term Debt	612.4	614.5
Senior Unsecured Notes [Member] | Two Point Three Zero Zero Percent Due Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.30%	2.30%
Long-term Debt	647.9	647.5
Senior Unsecured Notes [Member] | Two Point Two Five Zero Percent Due Two Thousand Nineteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%	2.25%
Long-term Debt	848.1	0
Senior Unsecured Notes [Member] | Seven Point Zero Zero Zero Percent Due Two Thousand Nineteen [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%	7.00%
Long-term Debt	441.6	452.9
Senior Unsecured Notes [Member] | Four Point Three Five Zero Percent Due Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.35%	4.35%
Long-term Debt	692.5	688.9
Senior Unsecured Notes [Member] | Three Point Seven Zero Zero Percent Due Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%	3.70%
Long-term Debt	699.4	699.4
Senior Unsecured Notes [Member] | Three Point One Two Five Percent Due Two Thousand Twenty Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.125%	3.125%
Long-term Debt	846.6	846.3
Senior Unsecured Notes [Member] | Three Point Three Zero Zero Percent Due Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.30%	3.30%
Long-term Debt	997.1	996.9
Senior Unsecured Notes [Member] | Three Point Five Zero Zero Percent Due Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%	3.50%
Long-term Debt	796.0	0
Senior Unsecured Notes [Member] | Five Point Nine Five Zero Percent Due Two Thousand Thirty Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.95%	5.95%
Long-term Debt	447.3	447.3
Senior Unsecured Notes [Member] | Five Point Eight Five Zero Percent Due Two Thousand Thirty Six [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.85%	5.85%
Long-term Debt	771.9	775.6
Senior Unsecured Notes [Member] | Six Point Three Seven Five Percent Due Two Thousand Thirty Seven [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
Long-term Debt	644.1	651.4
Senior Unsecured Notes [Member] | Five Point Eight Zero Zero Percent Due Two Thousand Forty [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.80%	5.80%
Long-term Debt	208.3	216.2
Senior Unsecured Notes [Member] | Four Point Six Two Five Percent Due Two Thousand Forty Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%	4.625%
Long-term Debt	893.9	893.9
Senior Unsecured Notes [Member] | Four Point Six Five Zero Percent Due Two Thousand Forty Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.65%	4.65%
Long-term Debt	994.4	994.4
Senior Unsecured Notes [Member] | Four Point Six Five Zero Percent Due Two Thousand Forty Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.65%	4.65%
Long-term Debt	798.3	0
Senior Unsecured Notes [Member] | Five Point One Zero Zero Percent Due Two Thousand Forty Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.10%	5.10%
Long-term Debt	599.2	599.1
Senior Unsecured Notes [Member] | Four Point Eight Five Zero Percent Due Two Thousand Fifty Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.85%	4.85%
Long-term Debt	249.4	0
Senior Convertible Debentures [Member] | Two Point Seven Five Zero Percent Due Two Thousand Forty Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%	2.75%
Long-term Debt	972.3	966.0
Surplus Notes [Member] | Nine Point Zero Zero Zero Percent Due Two Thousand Twenty Seven [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.00%	9.00%
Long-term Debt	24.9	24.9
Commercial Paper
Debt Instrument [Line Items]
Long-term Debt	$ 425.8	$ 379.2