Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 03, 2020	Mar. 29, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	$ 3,542.8
Increase (decrease), before reclassifications	(33.8)	$ (37.8)
Other Comprehensive Income (Loss) before Reclassifications, Tax	(12.3)	0.0
Other comprehensive income (loss) before reclassifications, net of income taxes	(46.1)	(37.8)
Increase (decrease), reclassified	0.5	0.2
Income tax impact, reclassified	(0.1)	(0.1)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0.4	0.1
Net current period other comprehensive income (loss), net of income taxes	(45.7)	(37.7)
Balance, end of period	3,486.3
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(116.4)	(74.3)
Increase (decrease), before reclassifications	(22.1)	(37.8)
Other Comprehensive Income (Loss) before Reclassifications, Tax	(15.1)	0.0
Other comprehensive income (loss) before reclassifications, net of income taxes	(37.2)	(37.8)
Increase (decrease), reclassified	0.0	0.0
Income tax impact, reclassified	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0.0	0.0
Net current period other comprehensive income (loss), net of income taxes	(37.2)	(37.8)
Balance, end of period	(153.6)	(112.1)
Unrealized Gain (Loss) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	0.1	0.0
Increase (decrease), before reclassifications	(11.7)	0.0
Other Comprehensive Income (Loss) before Reclassifications, Tax	2.8	0.0
Other comprehensive income (loss) before reclassifications, net of income taxes	(8.9)	0.0
Increase (decrease), reclassified	0.0	0.0
Income tax impact, reclassified	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0.0	0.0
Net current period other comprehensive income (loss), net of income taxes	(8.9)	0.0
Balance, end of period	(8.8)	0.0
Unrealized Pension Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(27.9)	(3.9)
Increase (decrease), before reclassifications	0.0	0.0
Other Comprehensive Income (Loss) before Reclassifications, Tax	0.0	0.0
Other comprehensive income (loss) before reclassifications, net of income taxes	0.0	0.0
Increase (decrease), reclassified	0.5	0.2
Income tax impact, reclassified	(0.1)	(0.1)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0.4	0.1
Net current period other comprehensive income (loss), net of income taxes	0.4	0.1
Balance, end of period	(27.5)	(3.8)
Total Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(144.2)	(78.2)
Balance, end of period	$ (189.9)	$ (115.9)

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