Shared-based Compensation (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended			24 Months Ended
	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares reserved for future issuance		6,900,000
Stock-based compensation expense		$ 59,769,000	$ 98,788,000	$ 32,671,000
Acceleration of Auxilium employee equity awards at closing	$ 37,600,000		37,600,000
Unrecognized compensation cost		56,400,000
Issuance of ordinary shares related to the employee stock purchase plan		$ 5,119,000	$ 4,299,000	$ 4,600,000
Issuance of ordinary shares related to the employee stock purchase plan (in shares)		306,918	67,867	75,450
Stock Options
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Expiration period		10 years
Dividend yield		0.00%	0.00%	0.00%
Exercise price range, lower range limit (in dollars per share)		$ 14.3
Exercise price range, upper range limit (in dollars per share)		$ 89.68
Options exercised intrinsic value		$ 1,300,000	$ 27,200,000	$ 41,400,000
Options grated, weighted average grant date fair value (in dollars per share)		$ 11.46	$ 21.09	$ 20.28
Options outstanding		4,325,209	2,768,567	3,063,352	2,768,567		4,245,789
Stock Options | Minimum
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period		3 years
Stock Options | Maximum
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period		4 years
Nonvested Stock Options
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized compensation cost		$ 16,900,000
Weighted average remaining requisite service period, non-vested stock options		2 years 7 months 6 days
Restricted Stock Units (RSUs) | Minimum
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period		3 years
Restricted Stock Units (RSUs) | Maximum
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period		4 years
Performance Stock Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Performance cycle		3 years			3 years
Service period		3 years
Performance Stock Units | Minimum
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award adjustment rate		0.00%			0.00%
Performance Stock Units | Maximum
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Award adjustment rate		300.00%			300.00%
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Weighted average remaining requisite service period, non-vested restricted stock units		2 years 3 months 18 days
Nonvested Restricted Stock Units And Performance Stock Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted and performance stock units, weighted average grant date fair value (in dollars per share)		$ 43.52	$ 72.34	$ 73.70	$ 72.34
Nonvested Restricted Stock
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized compensation cost		$ 30,500,000
Nonvested Performance Stock Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized compensation cost		9,000,000
AMS
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock-based compensation expense			$ 11,400,000
2015 Stock Incentive Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of shares authorized						10,000,000.0
2010 Stock Incentive Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of shares available for grant						5,000,000.0
2014 Share Matching Program | Performance Stock Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period					3 years
Vesting percentage (at least)					10.00%
Employee Stock Purchase Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock-based compensation expense		$ 800,000	$ 800,000	$ 600,000
Employee contribution (percent)		10.00%
Percentage of price per common share (percent)		90.00%
ESPP Contribution amount, numerator		$ 25,000
Common shares outstanding (percent)		1.00%
Options outstanding		1,200,000