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Debt (Long-term Debt) (Details) - USD ($)	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal amount	$ 3,380,827,000		$ 2,951,822,000
Less: unamortized discount and issuance costs	28,796,000		23,617,000
Plus: unamortized interest rate swap proceeds	12,859,000		22,463,000
Total debt	3,364,890,000		2,950,668,000
Less: current portion long-term debt	614,485,000		461,085,000
Long-term debt	2,750,405,000		2,489,583,000
Commercial Paper
Debt Instrument [Line Items]
Commercial paper	$ 0		90,000,000
Notes due January 2016
Debt Instrument [Line Items]
Interest rate	4.75%
Debt face amount	$ 0		370,914,000
Notes due September 2017
Debt Instrument [Line Items]
Interest rate	5.75%
Debt face amount	$ 385,109,000		385,109,000
Notes due March 2018
Debt Instrument [Line Items]
Interest rate	5.60%
Debt face amount	$ 250,000,000		250,000,000
Notes due May 2018
Debt Instrument [Line Items]
Interest rate	4.75%
Debt face amount	$ 350,000,000		350,000,000
Notes due March 2019
Debt Instrument [Line Items]
Interest rate	6.25%
Debt face amount	$ 300,000,000		300,000,000
Notes due October 2021
Debt Instrument [Line Items]
Interest rate	3.375%	3.375%
Total debt	$ 600,000,000	$ 600,000,000	0
Notes due March 2024
Debt Instrument [Line Items]
Interest rate	4.625%
Debt face amount	$ 500,000,000		500,000,000
Notes due January 2037
Debt Instrument [Line Items]
Interest rate	5.25%
Debt face amount	$ 115,041,000		115,041,000
Notes due March 2043
Debt Instrument [Line Items]
Interest rate	6.70%
Debt face amount	$ 425,000,000		425,000,000
Term loans
Debt Instrument [Line Items]
Debt face amount	450,000,000		150,000,000
Other debt
Debt Instrument [Line Items]
Debt face amount	$ 5,677,000		$ 15,758,000