Accumulated Other Comprehensive Income (Loss) - Rollforward (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 26, 2024 pension_plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 13,389.0	$ 13,407.2
Ending balance	13,525.5	13,525.5
Purchased annuity contracts, number of Canadian pension plans | pension_plan			2
Settlement loss	34.0	34.0
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(778.0)
Other comprehensive income (loss), before reclassifications, before tax		(3.5)
Ending balance	(804.5)	(804.5)
Accumulated foreign currency adjustment, excluding net investment hedging, attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss), before reclassifications, before tax		(15.4)
Accumulated foreign currency adjustment, net investment hedging, attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss), before reclassifications, before tax		(7.6)
AOCI foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss), before reclassifications, before tax		(15.4)
Gain (loss) on derivative instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		30.6
Other comprehensive income (loss), before reclassifications, before tax		1.6
Tax benefit (expense)		(0.3)
Ending balance	31.9	31.9
Pension and postretirement benefit adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(352.7)
Other comprehensive income (loss), before reclassifications, before tax		19.5
Reclassification of AOCI, current period, before tax		26.8
Tax benefit (expense)		(12.2)
Ending balance	(318.6)	(318.6)
Equity method investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(16.2)
Other comprehensive income (loss), before reclassifications, before tax		0.5
Tax benefit (expense)		(0.2)
Ending balance	(15.9)	(15.9)
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,217.3)	(1,116.3)
Tax benefit (expense)		(12.7)
Ending balance	$ (1,107.1)	$ (1,107.1)