Other Comprehensive Income or Loss - Changes in the AOCI Balance (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 08, 2018	Sep. 09, 2017	Sep. 08, 2018	Sep. 09, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 1,398.2
Other comprehensive income (loss) before reclassifications			2.2	$ 34.1
Amounts reclassified from accumulated other comprehensive income			(0.5)	17.9
Tax (expense) benefit			(0.6)	(17.9)
Other comprehensive income (loss)	$ (4.8)	$ 6.2	1.1	34.1
Ending balance	1,362.6		1,362.6
Total AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			191.1	(12.8)
Ending balance	192.2	21.3	192.2	21.3
Interest rate swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			18.9	(28.1)
Other comprehensive income (loss) before reclassifications			2.9	(22.4)
Amounts reclassified from accumulated other comprehensive income			1.7	20.9
Tax (expense) benefit			(1.2)	1.9
Other comprehensive income (loss)			3.4	0.4
Ending balance	22.3	(27.7)	22.3	(27.7)
Pension and Post-retirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			171.9	79.7
Other comprehensive income (loss) before reclassifications			0.0	2.1
Amounts reclassified from accumulated other comprehensive income			(1.5)	2.0
Tax (expense) benefit			0.4	(0.5)
Other comprehensive income (loss)			(1.1)	3.6
Ending balance	170.8	83.3	170.8	83.3
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(1.1)	(66.1)
Other comprehensive income (loss) before reclassifications			(0.7)	42.8
Amounts reclassified from accumulated other comprehensive income			0.0	0.0
Tax (expense) benefit			0.1	(16.9)
Other comprehensive income (loss)			(0.6)	25.9
Ending balance	(1.7)	(40.2)	(1.7)	(40.2)
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			1.4	1.7
Other comprehensive income (loss) before reclassifications			0.0	11.6
Amounts reclassified from accumulated other comprehensive income			(0.7)	(5.0)
Tax (expense) benefit			0.1	(2.4)
Other comprehensive income (loss)			(0.6)	4.2
Ending balance	$ 0.8	$ 5.9	$ 0.8	$ 5.9