CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 1,145.2	$ 1,255.5
Receivables - trade and other	310.1	301.3
Prepaid expenses and other current assets	29.5	23.5
Total current assets	1,484.8	1,580.3
PROPERTY AND EQUIPMENT:
Drilling equipment	8,979.1	8,965.3
Other property and equipment	139.9	135.5
Property and equipment - gross	9,119.0	9,100.8
Less accumulated depreciation and amortization	2,217.7	2,040.8
Property and equipment - net	6,901.3	7,060.0
Investment in unconsolidated subsidiary	25.0	0.0
Other assets	45.0	35.3
TOTAL ASSETS	8,456.1	8,675.6
CURRENT LIABILITIES:
Current portion of long-term debt	0.0	126.8
Accounts payable - trade	87.8	94.3
Deferred revenues	74.5	103.9
Accrued liabilities	134.9	158.8
Total current liabilities	297.2	483.8
Long-term debt, less current portion	2,516.6	2,553.4
Other liabilities	309.8	338.8
Deferred income taxes - net	22.4	185.7
Commitments and contingent liabilities
SHAREHOLDERS' EQUITY:
Class A Ordinary Shares, $0.125 par value, 128.1 and 128.0 shares issued, respectively; and 126.2 and 125.5 shares outstanding, respectively	16.0	16.0
Additional paid-in capital	1,480.1	1,471.7
Retained earnings	4,018.6	3,830.4
Cost of 1.9 and 2.5 treasury shares, respectively	(9.3)	(7.2)
Accumulated other comprehensive loss	(195.3)	(197.0)
Total shareholders' equity	5,310.1	5,113.9
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 8,456.1	$ 8,675.6