Accumulated Other Comprehensive (Loss) Income - Changes in OCI (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, value	$ 1,717.8
Balance, value	1,743.7	$ 1,717.8
Net unrealized foreign currency translation gain (loss)	(0.9)	(8.2)	$ 18.7
Changes in Fair Value of Effective Cash Flow Hedges
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, value	(5.8)	(1.4)
Other comprehensive (loss) income before reclassifications	(12.5)	(0.6)
Amounts reclassified from accumulated other comprehensive (loss) income	(7.2)	(3.8)
Net current period other comprehensive loss	(19.7)	(4.4)
Balance, value	(25.5)	(5.8)	(1.4)
Tax on other comprehensive income (loss) before reclassifications	2.9
Foreign Currency Translation Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, value	(14.9)	(6.7)
Other comprehensive (loss) income before reclassifications	(0.9)	(8.2)
Amounts reclassified from accumulated other comprehensive (loss) income	0.0	0.0
Net current period other comprehensive loss	(0.9)	(8.2)
Balance, value	(15.8)	(14.9)	(6.7)
Net unrealized foreign currency translation gain (loss)	1.2	1.3
Retirement Benefit Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, value	(20.9)	(22.5)
Other comprehensive (loss) income before reclassifications	(3.7)	0.8
Amounts reclassified from accumulated other comprehensive (loss) income	0.5	0.8
Net current period other comprehensive loss	(3.2)	1.6
Balance, value	(24.1)	(20.9)	(22.5)
Accumulated Other Comprehensive Income (Loss)
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, value	(41.6)	(30.6)	(44.2)
Other comprehensive (loss) income before reclassifications	(17.1)	(8.0)
Amounts reclassified from accumulated other comprehensive (loss) income	(6.7)	(3.0)
Net current period other comprehensive loss	(23.8)	(11.0)
Balance, value	$ (65.4)	$ (41.6)	$ (30.6)

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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