Shareholders' Equity (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Jul. 01, 2016 USD ($) shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 $ / shares shares	Nov. 19, 2013 USD ($)
Number of Ordinary Shares received for each share of common stock	1
Changes in shares associated with the Redomicile Transaction	52,529,197
Treasury shares cancelled, shares	7,310,022
Treasury shares cancelled, value | $	$ 106.5
Ordinary shares, shares outstanding		45,326,430	44,953,620
Treasury shares, shares			7,175,775
Convertible Senior Notes 1.00 percent due 2020 [Member]
Debt instrument, fair value of embedded option | $		$ 71.7		$ 71.7
Purchase of convertible hedges | $		72.6
Proceeds from issuance of warrants | $		40.5
Deferred financing cost allocated to equity | $		$ 1.6
Ordinary Shares
Par or nominal value per share | $ / shares		$ 0.01
Ordinary shares, shares outstanding		45,326,430
Common Class A
Number of Ordinary Shares received for each share of common stock	1
Par or nominal value per share | $ / shares			$ 0.0001
Ordinary shares, shares authorized			125,000,000
Ordinary shares, shares outstanding			44,953,620