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Changes in Accumulated Other Comprehensive Loss - Reclassifications from Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, tax	$ 0.2	$ 0.0	$ 0.4	$ 0.0
Other income and expense	25.6	8.7	58.2	87.6
Net income	(167.1)	(108.9)	(463.9)	(282.0)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	(1.0)	(0.3)	(1.8)	(0.1)
Effects of Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income and expense	$ (1.0)	$ (0.3)	$ (1.8)	$ (0.1)

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Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax

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