Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance			$ (98.5)	$ (198.4)
OCI before reclassifications			(12.3)	63.1
Amounts reclassified from AOCI to earnings			3.0	(0.1)
Other comprehensive income (loss), net of tax	$ (6.4)	$ 28.7	(9.3)	63.0
Ending balance	(107.8)	(135.4)	(107.8)	(135.4)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax			3.4	(20.1)
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax			25.4	(39.0)
Gain (Loss) on Derivative Used in Net Investment Hedge, Tax			8.1	(23.7)
Other Comprehensive Income (Loss), Cash Flow Hedges, Tax			3.0	(2.0)
Foreign Currency Translation Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance			(79.3)	(206.2)
OCI before reclassifications			(36.9)	87.7
Amounts reclassified from AOCI to earnings			0.0	0.0
Other comprehensive income (loss), net of tax			(36.9)	87.7
Ending balance	(116.2)	(118.5)	(116.2)	(118.5)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance			(16.0)	14.6
OCI before reclassifications			24.4	(23.9)
Amounts reclassified from AOCI to earnings			3.1	(0.4)
Other comprehensive income (loss), net of tax			27.5	(24.3)
Ending balance	11.5	(9.7)	11.5	(9.7)
Net Unrealized Gains (Losses) on Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance			(3.2)	(6.8)
OCI before reclassifications			0.2	(0.7)
Amounts reclassified from AOCI to earnings			(0.1)	0.3
Other comprehensive income (loss), net of tax			0.1	(0.4)
Ending balance	$ (3.1)	$ (7.2)	$ (3.1)	$ (7.2)

Gain (Loss) on Derivative Used in Net Investment Hedge, Tax

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit), after 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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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge.

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