Accumulated Other Comprehensive Income (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 25, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period	$ 31.9		$ 3.8
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized loss on derivatives, before tax	0.2		0.2
Amortization of unrealized loss on derivatives, tax	0.0		0.0
Amortization of unrealized loss on derivatives, net of tax	0.2		0.2
Amortization of pension and post-retirement plans, net actuarial loss	2.3	[1]	2.6
Amortization of pension and post-retirement plans, prior service credit	(0.6)	[1]	(0.7)
Divestiture of discontinued operations	(3.1)		0.0
Plan settlements	69.2		3.7
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	67.8		5.6
Amortization of pension and post-retirement plans, tax	(31.4)		(2.0)
Amortization of pension and post-retirement plans, net of tax	36.4		3.6
Currency translation	$ (4.7)		$ 0.0

[1] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost. See Note 12 for additional details.