Accumulated Other Comprehensive Income (Loss) (Changes in OCI) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 26, 2015	Jun. 27, 2014	Dec. 26, 2014	Dec. 27, 2013
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	[1]	$ (3.2)	$ (1.0)	$ 2.6	$ (3.4)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1]	13.6	0.4
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	(19.4)	2.0
Net current period other comprehensive income (loss)	[1]	(5.8)	2.4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest		(0.3)	0.4
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Noncontrolling Interest		0.1	0.2
Changes in Fair Value of Effective Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	[1]	25.2	(3.5)	25.2	(3.1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1]	20.2	(1.8)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	(20.2)	1.4
Net current period other comprehensive income (loss)	[1]	0.0	(0.4)
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	[1]	(7.3)	13.9	(0.8)	12.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1],[2]	(6.5)	1.9
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	0.0	0.0
Net current period other comprehensive income (loss)	[1]	(6.5)	1.9
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		(3.5)	(0.3)
Retirement Benefit Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss	[1]	(21.1)	(11.4)	$ (21.8)	$ (12.3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1],[3]	(0.1)	0.3
Other comprehensive income (loss) before reclassifications		0.1	0.2
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	0.8	0.6
Net current period other comprehensive income (loss)	[1]	$ 0.7	$ 0.9

[1] All amounts are net of tax and noncontrolling interest.

[2] Includes a loss of $3.5 million for the six months ended June 26, 2015 and a loss of $0.3 million for the six months ended June 27, 2014 on intra-entity foreign currency transactions that are of a long-term-investment nature

[3] Includes a loss of $0.1 million and $0.2 million of noncontrolling interest related to Retirement Benefit adjustment for the six months ended June 26, 2015 and June 27, 2014