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Basis of Presentation, Early Termination Revenue and Abondonments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Basis of Presentation
Early termination revenue	$ 6.2	$ 79.6	$ 19.7	$ 108.4
Abandonments	$ 18.6	$ 0.3	$ 19.4	$ 0.8

X

- Definition

Revenue related to early termination of contract.

+ References

No definition available.

+ Details

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X

- Definition

Loss recognized as a result of the initial and subsequent write-down of a long-lived asset's carrying amount to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

+ Details

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Balance Type:	debit
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X

- References

No definition available.

+ Details

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