Accumulated Other Comprehensive Income (Loss) - Rollforward (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) pension_plan	Dec. 31, 2024 USD ($) pension_plan	Dec. 31, 2023 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 13,284.2	$ 13,407.2	$ 12,915.2
Ending balance	10,427.1	$ 13,284.2	13,407.2
Settlement loss	$ 34.0
Purchased annuity contracts, number of Canadian pension plans | pension_plan	2	2
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ (1,362.4)	$ (1,116.3)	(1,205.5)
Tax benefit (expense)	29.9	(41.3)	13.3
Ending balance	(1,071.6)	(1,362.4)	(1,116.3)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,087.0)	(778.0)	(875.2)
Reclassification of AOCI, current period, before tax		(3.5)	(0.7)
Tax benefit (expense)	30.9	(20.2)	10.9
Ending balance	(797.6)	(1,087.0)	(778.0)
Accumulated foreign currency adjustment, excluding net investment hedging, attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
OCI before reclassifications before tax	369.3	(339.9)	113.5
Accumulated foreign currency adjustment, net investment hedging, attributable to parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
OCI before reclassifications before tax	(110.8)	54.6	(26.5)
AOCI foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
OCI before reclassifications before tax	369.3	(339.9)	113.5
Gain (loss) on derivative instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	83.6	30.6	32.2
OCI before reclassifications before tax	(19.5)	70.6	(3.6)
Reclassification of AOCI, current period, before tax	(1.1)	(0.3)	1.3
Tax benefit (expense)	5.2	(17.3)	0.7
Ending balance	68.2	83.6	30.6
Pension and postretirement benefit adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(342.4)	(352.7)	(335.1)
Reclassification of AOCI, current period, before tax	(7.6)	24.3	(15.0)
Tax benefit (expense)	(5.8)	(3.9)	5.9
Ending balance	(326.8)	(342.4)	(352.7)
Net change in pension and other postretirement benefit assets and liabilities recognized in other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
OCI before reclassifications before tax	29.0	(10.1)	(8.5)
Equity method investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(16.6)	(16.2)	(27.4)
OCI before reclassifications before tax	1.6	(0.5)	15.4
Tax benefit (expense)	(0.4)	0.1	(4.2)
Ending balance	$ (15.4)	$ (16.6)	$ (16.2)