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Marketable Securities (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Marketable debt securities, Cost	$ 1,742.1
Marketable debt securities, Fair Value	1,687.6
Marketable equity securities, Cost	10.0	$ 10.0
Marketable equity securities, Unrealized Losses	7.1	8.8
Marketable equity securities, Fair Value	2.9	1.2
Total marketable securities, Cost	1,752.1	1,681.1
Total marketable securities, Unrealized Gains	0.3	0.9
Total marketable securities, Unrealized Losses	61.9	67.8
Total marketable securities, Fair Value	1,690.5	1,614.2
U.S. tax-exempt securities
Schedule Of Available For Sale Securities [Line Items]
Marketable debt securities, Cost	333.2	452.8
Marketable debt securities, Unrealized Gains	0.1	0.5
Marketable debt securities, Unrealized Losses	6.2	8.2
Marketable debt securities, Fair Value	327.1	445.1
U.S. corporate securities
Schedule Of Available For Sale Securities [Line Items]
Marketable debt securities, Cost	309.4	262.5
Marketable debt securities, Unrealized Gains	0.1	0.1
Marketable debt securities, Unrealized Losses	10.4	11.6
Marketable debt securities, Fair Value	299.1	251.0
U.S. taxable municipal / non-U.S. provincial bonds
Schedule Of Available For Sale Securities [Line Items]
Marketable debt securities, Cost	230.2	191.6
Marketable debt securities, Unrealized Losses	9.7	10.8
Marketable debt securities, Fair Value	220.5	180.8
U.S. government and agency securities
Schedule Of Available For Sale Securities [Line Items]
Marketable debt securities, Cost	150.6	118.0
Marketable debt securities, Unrealized Gains		0.1
Marketable debt securities, Unrealized Losses	4.0	3.1
Marketable debt securities, Fair Value	146.6	115.0
Non-U.S. corporate securities
Schedule Of Available For Sale Securities [Line Items]
Marketable debt securities, Cost	500.8	467.9
Marketable debt securities, Unrealized Losses	16.9	17.9
Marketable debt securities, Fair Value	483.9	450.0
Non-U.S. government securities
Schedule Of Available For Sale Securities [Line Items]
Marketable debt securities, Cost	113.4	78.9
Marketable debt securities, Unrealized Gains	0.1	0.2
Marketable debt securities, Unrealized Losses	3.2	2.7
Marketable debt securities, Fair Value	110.3	76.4
Other debt securities
Schedule Of Available For Sale Securities [Line Items]
Marketable debt securities, Cost	104.5	99.4
Marketable debt securities, Unrealized Losses	4.4	4.7
Marketable debt securities, Fair Value	$ 100.1	$ 94.7

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