Acquisitions (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Jun. 13, 2014	Sep. 30, 2014 Geo [Member]	May 16, 2014 Geo [Member]
Deferred income tax assets:
Net operating loss carryforwards	$ 13.7		$ 2.5
Deferred revenue			4.4
Total deferred income tax assets			6.9
Deferred income tax liabilities:
Property and equipment			(32.7)
Intangible assets			(12.2)
Total deferred income tax liabilities			(44.9)
Net deferred income tax assets/(liabilities)		$ 38.0	$ (38.0)