Debt (Details) (USD $)	3 Months Ended	9 Months Ended			3 Months Ended																3 Months Ended
	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Term loans	Dec. 31, 2013 Term loans	Sep. 30, 2014 Debt due 2015	Dec. 31, 2013 Debt due 2015	Sep. 30, 2014 Debt due 2016	Dec. 31, 2013 Debt due 2016	Sep. 30, 2014 Debt due 2017	Dec. 31, 2013 Debt due 2017	Sep. 30, 2014 5.60% Debt due 2018	Dec. 31, 2013 5.60% Debt due 2018	Sep. 30, 2014 4.75% Debt due 2018	Dec. 31, 2013 4.75% Debt due 2018	Sep. 30, 2014 Debt due 2019	Dec. 31, 2013 Debt due 2019	Sep. 30, 2014 Debt due 2022	Dec. 31, 2013 Debt due 2022	Mar. 31, 2014 Debt due 2024	Sep. 30, 2014 Debt due 2024	Dec. 31, 2013 Debt due 2024	Sep. 30, 2014 Debt due 2037	Dec. 31, 2013 Debt due 2037	Sep. 30, 2014 Debt due 2043	Dec. 31, 2013 Debt due 2043
Debt Instrument [Line Items]
Stated interest rate							5.00%		4.75%		5.75%		5.60%		4.75%		6.25%		5.25%			4.625%		5.25%		6.70%
Debt instrument, term																					10 years
Debt instrument, face amount					$ 130,000,000	$ 230,000,000	$ 274,879,000	$ 274,879,000	$ 370,914,000	$ 370,914,000	$ 385,109,000	$ 500,000,000	$ 250,000,000	$ 250,000,000	$ 350,000,000	$ 350,000,000	$ 300,000,000	$ 300,000,000	$ 110,000,000	$ 110,000,000		$ 500,000,000	$ 0	$ 115,041,000	$ 500,000,000	$ 425,000,000	$ 425,000,000
Other		26,933,000		35,502,000
Total long-term debt		3,237,876,000		3,346,295,000
Current portion		274,879,000		0
Long-term debt		2,962,997,000		3,346,295,000
Extinguishment of debt	500,000,000
Gains (losses) on extinguishment of debt	62,000,000
Net proceeds from issuance of notes		492,525,000	411,613,000																		493,000,000
Repayments of Long-term Debt		$ 599,850,000	$ 779,637,000		$ 100,000,000