Reorganization Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		11 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
Reorganization Costs
Reorganization costs	$ 49.4	$ 17.5
Reorganization cost incurred to date			114.0
Restructuring Reserve (Roll Forward)
Reorganization Reserve Opening liability	24.8
Amounts charged to re-organization	49.4	17.5
Reorganization liability, Paid and Utilized	(59.0)
Reorganization Reserve Closing liability	15.2		15.2
Reorganization liability, Current	15.2		15.2
Involuntary termination benefits
Reorganization Costs
Reorganization costs	42.2
Restructuring Reserve (Roll Forward)
Reorganization Reserve Opening liability	15.3
Amounts charged to re-organization	42.2
Reorganization liability, Paid and Utilized	(44.5)
Reorganization Reserve Closing liability	13.0		13.0
Other reorganization costs
Reorganization Costs
Reorganization costs	7.2
Restructuring Reserve (Roll Forward)
Reorganization Reserve Opening liability	9.5
Amounts charged to re-organization	7.2
Reorganization liability, Paid and Utilized	(14.5)
Reorganization Reserve Closing liability	2.2		2.2
"One Shire" business re-alignment
Reorganization Costs
Reorganization costs	49.4
Reorganizations costs, expected costs	101.0
Restructuring Reserve (Roll Forward)
Amounts charged to re-organization	$ 49.4