CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 1,032.4	$ 1,332.1
Receivables - trade and other	281.5	212.8
Prepaid expenses and other current assets	31.4	15.5
Total current assets	1,345.3	1,560.4
PROPERTY AND EQUIPMENT:
Drilling equipment	8,864.1	8,697.8
Other property and equipment	140.9	136.1
Property and equipment - gross	9,005.0	8,833.9
Less accumulated depreciation and amortization	2,566.9	2,281.2
Property and equipment - net	6,438.1	6,552.7
Long-term note receivable from unconsolidated subsidiary	269.0	270.2
Investment in unconsolidated subsidiary	34.3	30.9
Other assets	44.7	44.1
TOTAL ASSETS	8,131.4	8,458.3
CURRENT LIABILITIES:
Current portion of long-term debt	201.1	0.0
Accounts payable - trade	112.2	97.2
Deferred revenues	17.8	1.1
Accrued liabilities	122.2	159.1
Total current liabilities	453.3	257.4
Long-term debt	2,309.6	2,510.3
Other liabilities	268.6	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; 127.1 and 126.3 shares outstanding, respectively	16.0	16.0
Additional paid-in capital	1,497.4	1,488.6
Retained earnings	3,824.8	4,109.7
Cost of 1.1 and 1.8 treasury shares, respectively	(7.7)	(9.3)
Accumulated other comprehensive loss	(241.7)	(218.9)
Total shareholders' equity	5,088.8	5,386.1
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 8,131.4	$ 8,458.3