Accumulated Other Comprehensive Income (Loss) - Changes in Components of Accumulated Other Comprehensive Income, Net of Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Apr. 01, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,595.0
Other comprehensive (loss) income, net of tax	21.0
Ending balance	1,805.2
Accumulated other comprehensive income, tax (benefit) provision	(1.6)		$ 0.8
Other comprehensive income (loss) before reclassifications, tax provision	2.1
Net losses on long-term transactions	2.8
Foreign Currency Translation (Losses) Gains
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(86.1)	$ (77.7)
Other comprehensive loss before reclassifications	37.1	(0.7)
Less: amounts reclassified from AOCI to earnings	0.0	0.0
Other comprehensive (loss) income, net of tax	37.1	(0.7)
Ending balance	(49.0)	(78.4)
Net (Losses) Gains on Derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	5.5	(3.2)
Other comprehensive loss before reclassifications	(13.2)	1.9
Less: amounts reclassified from AOCI to earnings	2.9	0.1
Other comprehensive (loss) income, net of tax	(16.1)	1.8
Ending balance	(10.6)	(1.4)
Other Comprehensive (Loss) Income Attributable to MKHL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(80.6)	(80.9)
Other comprehensive loss before reclassifications	23.9	1.2
Less: amounts reclassified from AOCI to earnings	2.9	0.1
Other comprehensive (loss) income, net of tax	21.0	1.1
Ending balance	(59.6)	(79.8)
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(0.3)	0.1
Other comprehensive loss before reclassifications	0.0	0.0
Less: amounts reclassified from AOCI to earnings	0.0	0.0
Other comprehensive (loss) income, net of tax	0.0	0.0
Ending balance	(0.3)	0.1
Total Accumulated Other Comprehensive (Loss) Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(80.9)	(80.8)
Other comprehensive loss before reclassifications	23.9	1.2
Less: amounts reclassified from AOCI to earnings	2.9	0.1
Other comprehensive (loss) income, net of tax	21.0	1.1
Ending balance	$ (59.9)	$ (79.7)