Consolidated Statements of Cash Flows, Non-cash Investing and Financing Activities (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Non-Cash Purchases of Property and Equipment
Non-cash purchases of property and equipment	$ (2.3)	$ 15.7
Additional finance lease obligations for build-to-suit leases and other	35.1	17.6
Acquisition of property and equipment by capital leases
Non-Cash Purchases of Property and Equipment
Non-cash purchases of property and equipment	0	0.9
Increase (decrease) in property and equipment in accounts payable and accrued expenses
Non-Cash Purchases of Property and Equipment
Non-cash purchases of property and equipment	$ (2.3)	$ 14.8