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Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Long-term debt
Other	$ 6,209,000us-gaap_OtherLongTermDebt	$ 10,243,000us-gaap_OtherLongTermDebt
Long-term Debt, Total	4,355,049,000us-gaap_LongTermDebt	3,914,302,000us-gaap_LongTermDebt
Less: Current portion	6,190,000us-gaap_DebtCurrent	10,185,000us-gaap_DebtCurrent
Long-term debt	4,348,859,000us-gaap_LongTermDebtNoncurrent	3,904,117,000us-gaap_LongTermDebtNoncurrent
Senior Notes Due September 2016
Long-term debt
Senior Notes	349,887,000	349,820,000
Interest rate on senior notes due (as a percent)	2.35%		2.35%
Senior Notes Due February 2018
Long-term debt
Senior Notes	930,693,000	969,928,000
Interest rate on senior notes due (as a percent)	6.15%
Senior Notes Due January 2019
Long-term debt
Senior Notes	339,607,000	339,607,000
Interest rate on senior notes due (as a percent)	9.25%	9.25%	9.25%
Senior Notes Due September 2020
Long-term debt
Senior Notes	698,253,000	697,947,000
Interest rate on senior notes due (as a percent)	5.00%
Senior Notes Due September 2021
Long-term debt
Senior Notes	698,388,000	698,148,000
Interest rate on senior notes due (as a percent)	4.625%
Senior Notes Due September 2023
Long-term debt
Senior Notes	348,893,000	348,765,000
Interest rate on senior notes due (as a percent)	5.10%		5.10%
Revolving Credit Facility
Long-term debt
Revolving credit facility	450,000,000	170,000,000
Commercial Paper
Long-term debt
Long-term Debt, Total	$ 533,119,000	$ 329,844,000