CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 1,132.7	$ 1,332.1
Receivables - trade and other	238.1	212.8
Prepaid expenses and other current assets	15.1	15.5
Total current assets	1,385.9	1,560.4
PROPERTY AND EQUIPMENT:
Drilling equipment	8,832.3	8,697.8
Other property and equipment	137.3	136.1
Property and equipment - gross	8,969.6	8,833.9
Less accumulated depreciation and amortization	2,471.6	2,281.2
Property and equipment - net	6,498.0	6,552.7
Long-term note receivable from unconsolidated subsidiary	269.6	270.2
Investment in unconsolidated subsidiary	31.2	30.9
Other assets	46.2	44.1
TOTAL ASSETS	8,230.9	8,458.3
CURRENT LIABILITIES:
Accounts payable - trade	89.5	97.2
Deferred revenues	6.8	1.1
Accrued liabilities	131.3	159.1
Total current liabilities	227.6	257.4
Long-term debt	2,510.6	2,510.3
Other liabilities	251.9	293.6
Deferred income taxes - net	11.1	10.9
Commitments and contingent liabilities
SHAREHOLDERS' EQUITY:
Class A Ordinary Shares, $0.125 par value; 128.2 and 128.1 shares issued, respectively; 127.0 and 126.3 shares outstanding, respectively	16.0	16.0
Additional paid-in capital	1,493.6	1,488.6
Retained earnings	3,968.9	4,109.7
Cost of 1.2 and 1.8 treasury shares, respectively	(7.8)	(9.3)
Accumulated other comprehensive loss	(241.0)	(218.9)
Total shareholders' equity	5,229.7	5,386.1
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 8,230.9	$ 8,458.3