Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 77.2	$ 109.3
Restricted cash	3.1	2.4
Accounts receivable, net of allowance for doubtful accounts of $1.6 and $1.6, respectively	121.5	114.6
Deferred contract costs	11.7	10.3
Prepaid and other current assets	23.3	23.8
Total current assets	236.8	260.4
Property and equipment, net of accumulated depreciation of $1,462.9 and $1,387.8, respectively	1,950.9	2,002.5
Goodwill	578.1	578.1
Intangible assets, net of accumulated amortization of $43.3 and $39.0, respectively	82.7	87.0
Long-term restricted cash	9.1	4.8
Long-term deferred contract costs	49.4	49.3
Other assets	29.6	27.8
Total assets	2,936.6	3,009.9
Current Liabilities:
Accounts payable	14.8	15.0
Current portion of long-term debt	12.8	47.2
Deferred revenue	84.8	86.3
Other accrued liabilities	53.7	70.7
Total current liabilities	166.1	219.2
Long-term debt, net of discount and debt issuance costs	1,240.1	1,242.1
Deferred revenue, non-current	199.2	216.9
Deferred income taxes, net, non-current	119.5	124.0
Other liabilities	37.9	34.8
Total liabilities	1,762.8	1,837.0
COMMITMENTS AND CONTINGENCIES (Note 13)
Stockholders' equity:
Common stock; $0.001 par value; 250.0 shares authorized; 77.5 shares issued and 61.9 shares outstanding at March 31, 2017 and 77.0 shares issued and 61.4 shares outstanding at December 31, 2016	0.2	0.2
Treasury stock, at cost; 15.6 shares at March 31, 2017 and December 31, 2016	(342.0)	(342.0)
Additional paid-in capital	1,519.3	1,518.3
Accumulated deficit	(3.7)	(3.6)
Total stockholders' equity	1,173.8	1,172.9
Total liabilities and stockholders' equity	2,936.6	3,009.9
Series A convertible preferred stock
Stockholders' equity:
Series A convertible preferred stock, $0.001 par value; 0.08 shares authorized; 0.08 shares issued and outstanding at March 31, 2017 and December 31, 2016