Debt (Convertible Senior Subordinated Notes Due) (Narrative) (Details) (USD $)			0 Months Ended				1 Months Ended		9 Months Ended				0 Months Ended	1 Months Ended		9 Months Ended	1 Months Ended		9 Months Ended			0 Months Ended
	Sep. 30, 2014 5.75% Senior Notes Due 2022 [Member]	Dec. 31, 2013 5.75% Senior Notes Due 2022 [Member]	Jun. 30, 2014 5.735% Senior Notes Due 2023 [Member]	Sep. 30, 2014 5.735% Senior Notes Due 2023 [Member]	Jun. 30, 2014 5.735% Senior Notes Due 2023 [Member]	Dec. 31, 2013 5.735% Senior Notes Due 2023 [Member]	Jul. 31, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]	May 30, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]	Sep. 30, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]	Dec. 31, 2013 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]	Sep. 17, 2013 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]	Apr. 09, 2008 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member]	Apr. 09, 2008 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Warrants [Member]	Jul. 31, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Warrants [Member]	May 30, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Warrants [Member]	Sep. 30, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Warrants [Member]	Jul. 31, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Call Options Purchased [Member]	May 30, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Call Options Purchased [Member]	Sep. 30, 2014 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Call Options Purchased [Member]	Sep. 17, 2013 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Call Options Purchased [Member]	Apr. 09, 2008 1.75% Convertible Senior Subordinated Notes Due April 15, 2015 [Member] Call Options Purchased [Member]	Apr. 17, 2014 7.00% Senior Notes Due 2019 [Member]	Sep. 30, 2014 7.00% Senior Notes Due 2019 [Member]	May 06, 2014 7.00% Senior Notes Due 2019 [Member]	Apr. 17, 2014 7.00% Senior Notes Due 2019 [Member]	Dec. 31, 2013 7.00% Senior Notes Due 2019 [Member]	Sep. 30, 2014 7.00% senior notes due 2020 [Member]	May 06, 2014 7.00% senior notes due 2020 [Member]	Sep. 30, 2014 7.25% senior notes due 2022 [Member]	May 06, 2014 7.25% senior notes due 2022 [Member]	Sep. 30, 2014 EHSI 2019 Notes [Member]
Subsidiary, Sale of Stock [Line Items]
Principal amount of convertible notes	$ 700,000,000	$ 700,000,000		$ 750,000,000	$ 750,000,000	$ 0																	$ 499,875,000	$ 482,000,000		$ 500,000,000	$ 7,000,000	$ 393,000,000	$ 3,700,000	$ 396,300,000	$ 18,000,000
Notes, interest rate	5.75%			5.375%	5.375%				1.75%														7.00%	7.00%				7.00%		7.25%
Proceeds from issuance of notes			750,000,000
Debt issuance cost			12,600,000
Convertible notes, maturity date									Apr. 15, 2015										Apr. 15, 2015
Debt repurchase amount							40,000,000	240,700,000																481,900,000	11,700,000			393,000,000		396,300,000
Early repayment of subordinated debt							95,200,000	548,200,000
Stock issued during period, conversion of convertible securities (shares)							798,367
Stock issued during period, value, conversion of convertible securities							55,200,000
Convertible Note Gross									98,818,000	379,500,000
Loss on extinguishment of debt							2,000,000	14,800,000
Adjustments to additional paid in capital, equity component of convertible debt							365,000,000
Share price (usd per share)											$ 37.96
Percent of initial conversion price (percent)											130.00%
Initial conversion price									$ 29.20		$ 29.20
Share issued for repurchase of senior note (shares)													13,000,000	1,400,000	8,200,000	3,400,000	1,400,000	8,200,000	3,400,000
Convertible notes, convertible amount per share																				$ 40.00	$ 24.85
Convertible notes, conversion premium over the closing price												61.10%
Call option strike price per share													40.00						29.20
Cash paid on settlement														42,300,000	242,200,000		54,200,000	302,100,000
Debt extinguishment costs																						$ 5,300,000