Shareholders' Deficit (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	$ (866,544)
Effect of adopting accounting principle			$ (4,646)
Shareholders' equity, adjusted beginning balance			(502,929)
Net income (loss)	129,930	$ (18,573)
Other comprehensive income (loss)	(14,437)	4,730
Compensation related to share-based awards	17,645	24,733
Exercise of options		4
Tax withholding for restricted shares	(4,398)	(2,414)
Other	(13)	(1)
Shareholders' equity, ending balance	(737,817)	(494,450)
Euro Deferred Shares
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	45
Shareholders' equity, adjusted beginning balance			46
Other	(1)	(1)
Shareholders' equity, ending balance	44	45
Ordinary Shares
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	23
Shareholders' equity, adjusted beginning balance			22
Shareholders' equity, ending balance	23	22
Additional Paid-in Capital
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	8,904,692
Shareholders' equity, adjusted beginning balance			8,855,810
Compensation related to share-based awards	17,645	24,733
Exercise of options		4
Tax withholding for restricted shares	(4,398)	(2,414)
Other	(12)	0
Shareholders' equity, ending balance	8,917,927	8,878,133
Accumulated Deficit
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	(9,552,214)
Effect of adopting accounting principle			(4,646)
Shareholders' equity, adjusted beginning balance			(9,129,578)
Net income (loss)	129,930	(18,573)
Shareholders' equity, ending balance	(9,422,284)	(9,148,151)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Shareholders' equity, beginning balance	(219,090)
Shareholders' equity, adjusted beginning balance			$ (229,229)
Other comprehensive income (loss)	(14,437)	4,730
Shareholders' equity, ending balance	$ (233,527)	$ (224,499)