CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 1,026.7	$ 1,332.1
Receivables - trade and other	251.2	212.8
Prepaid expenses and other current assets	22.4	15.5
Total current assets	1,300.3	1,560.4
PROPERTY AND EQUIPMENT:
Drilling equipment	8,510.7	8,697.8
Other property and equipment	141.7	136.1
Property and equipment - gross	8,652.4	8,833.9
Less accumulated depreciation and amortization	2,451.4	2,281.2
Property and equipment - net	6,201.0	6,552.7
Long-term note receivable from unconsolidated subsidiary	456.0	270.2
Investment in unconsolidated subsidiary	41.2	30.9
Other assets	119.2	44.1
TOTAL ASSETS	8,117.7	8,458.3
CURRENT LIABILITIES:
Current portion of long-term debt	201.2	0.0
Accounts payable - trade	122.3	97.2
Deferred revenue	16.7	1.1
Accrued liabilities	113.4	159.1
Total current liabilities	453.6	257.4
Long-term debt	2,309.7	2,510.3
Other liabilities	307.7	293.6
Deferred income taxes - net	11.7	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	1,501.5	1,488.6
Retained earnings	3,810.5	4,109.7
Treasury shares, cost of 1.1 and 1.8, respectively	(7.9)	(9.3)
Accumulated other comprehensive loss	(285.1)	(218.9)
Total shareholders' equity	5,035.0	5,386.1
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 8,117.7	$ 8,458.3