Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 24, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ (72.5)	$ (65.3)
Other Comprehensive Income (Loss), before Reclassifications	28.2	(7.2)
Reclassification from Accumulated Other Comprehensive Income	36.3	6.8
Other Comprehensive Income (Loss)	64.5	(0.4)
Ending Balance	(8.0)	(65.7)
Accumulated Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(19.5)	(7.9)
Other Comprehensive Income (Loss), before Reclassifications	12.1	8.3
Reclassification from Accumulated Other Comprehensive Income	(4.7)	(0.7)
Other Comprehensive Income (Loss)	7.4	7.6
Ending Balance	(12.1)	(0.3)
Accumulated Unrecognized Gain (Loss) on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(5.7)	(6.3)
Other Comprehensive Income (Loss), before Reclassifications	0.0	0.0
Reclassification from Accumulated Other Comprehensive Income	0.6	0.4
Other Comprehensive Income (Loss)	0.6	0.4
Ending Balance	(5.1)	(5.9)
Accumulated Unrecognized Gain (Loss) on Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(47.3)	(51.1)
Other Comprehensive Income (Loss), before Reclassifications	5.5	(15.5)
Reclassification from Accumulated Other Comprehensive Income	40.4	7.1
Other Comprehensive Income (Loss)	45.9	(8.4)
Ending Balance	(1.4)	(59.5)
Accumulated Unrecognized Gain on Equity Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	0.0	0.0
Other Comprehensive Income (Loss), before Reclassifications	10.6	0.0
Reclassification from Accumulated Other Comprehensive Income	0.0	0.0
Other Comprehensive Income (Loss)	10.6	0.0
Ending Balance	$ 10.6	$ 0.0