Consolidated Statement of Shareholders' Equity - USD ($) $ in Millions	Total	Ordinary Shares	Additional Paid-in Capital	Treasury Shares	Accumulated Other Comprehensive Loss	Retained Earnings	Total Equity of MKHL	Non-controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 661.4
Comprehensive income	$ 630.3
Beginning balance (in shares) at Apr. 02, 2016	208,084,175	208,084,000
Beginning balance (in shares) at Apr. 02, 2016	(31,642,284)			(31,642,000)
Beginning balance at Apr. 02, 2016	$ 1,999.5	$ 0.0	$ 718.9	$ (1,650.1)	$ (80.9)	$ 3,007.8	$ 1,995.7	$ 3.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	578.3					579.3	579.3	(1.0)
Other comprehensive loss	(9.6)				(9.2)		(9.2)	(0.4)
Comprehensive income	568.7						570.1	(1.4)
Vesting of restricted awards, net of forfeitures (in shares)		451,000
Exercises of employee share options (in shares)		758,000
Exercises of employee share options	8.0		8.0				8.0
Equity compensation expense	26.7		26.7				26.7
Tax benefits on exercise of share options	6.4		6.4				6.4
Purchase of treasury shares (in shares)				(15,215,000)
Purchase of treasury shares	$ (754.8)			$ (754.8)			(754.8)
Ending balance (in shares) at Dec. 31, 2016	209,293,238	209,293,000
Ending balance (in shares) at Dec. 31, 2016	(46,857,374)			(46,857,000)
Ending balance at Dec. 31, 2016	$ 1,854.5	$ 0.0	$ 760.0	$ (2,404.9)	$ (90.1)	$ 3,587.1	$ 1,852.1	$ 2.4