Acquisitions Pro forma (Details) - USD ($) $ in Millions	3 Months Ended										6 Months Ended					12 Months Ended
	Dec. 31, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Dec. 31, 2015		Dec. 27, 2014	Dec. 28, 2013	[1]	Jun. 27, 2015		Jun. 28, 2014	Jun. 29, 2013
Business Combination, Separately Recognized Transactions [Line Items]
Business Acquisition, Pro Forma Revenue											$ 2,852.4					$ 5,971.9		$ 6,200.0
Net sales	$ 1,424.8	$ 1,344.7	$ 1,531.6	$ 1,049.1	$ 1,071.7	$ 951.5	$ 1,144.2	$ 1,004.2	$ 979.0	$ 933.4	2,769.5		$ 2,023.1			4,603.9		4,060.8	$ 3,539.8
Business Acquisition, Pro Forma Net Income (Loss)											38.3					214.8		374.6
Operating income											94.5	[1]	$ 321.5	$ 567.0		747.7	[1]	567.0	$ 679.1	[1]
Stub period 2015 acquisitions [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Net sales											51.0
Operating income											$ 20.6
Fiscal 2015 acquisitions [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Net sales																418.2
Operating income																18.9
Fiscal 2014 acquisitions [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Net sales																		168.5
Operating income																		$ (53.9)
Omega [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Foreign exchange impact on pro forma net sales																$ 189.3

[1] Amounts may not cross-foot due to rounding.