CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 1,173.2	$ 1,255.5
Receivables - trade and other	317.1	301.3
Prepaid expenses and other current assets	24.6	23.5
Total current assets	1,514.9	1,580.3
PROPERTY AND EQUIPMENT:
Drilling equipment	8,984.1	8,965.3
Other property and equipment	138.1	135.5
Property and equipment - gross	9,122.2	9,100.8
Less accumulated depreciation and amortization	2,138.4	2,040.8
Property and equipment - net	6,983.8	7,060.0
Other assets	54.6	35.3
TOTAL ASSETS	8,553.3	8,675.6
CURRENT LIABILITIES:
Current portion of long-term debt	0.0	126.8
Accounts payable - trade	93.1	94.3
Deferred revenues	108.2	103.9
Accrued liabilities	138.3	158.8
Total current liabilities	339.6	483.8
Long-term debt, less current portion	2,552.5	2,553.4
Other liabilities	320.6	338.8
Deferred income taxes - net	8.8	185.7
Commitments and contingent liabilities (Note 4)
SHAREHOLDERS' EQUITY:
Class A Ordinary Shares, $0.125 par value, 128.0 and 128.0 shares issued, respectively; and 126.1 and 125.5 shares outstanding, respectively	16.0	16.0
Additional paid-in capital	1,473.9	1,471.7
Retained earnings	4,047.3	3,830.4
Cost of 1.9 and 2.5 treasury shares, respectively	(9.3)	(7.2)
Accumulated other comprehensive loss	(196.1)	(197.0)
Total shareholders' equity	5,331.8	5,113.9
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 8,553.3	$ 8,675.6