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Marketable Securities (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost $ 1,544.3  
Marketable debt securities, Fair Value 1,508.6  
Marketable equity securities, Cost 15.4 $ 15.4
Marketable equity securities, Unrealized Gains   1.3
Marketable equity securities, Unrealized Losses 8.8 3.0
Marketable equity securities, Fair Value 6.6 13.7
Total marketable securities, Cost 1,559.7 1,562.7
Total marketable securities, Unrealized Gains 0.5 6.4
Total marketable securities, Unrealized Losses 45.0 9.7
Total marketable securities, Fair Value 1,515.2 1,559.4
U.S. tax-exempt securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 447.3 431.4
Marketable debt securities, Unrealized Gains 0.1 1.5
Marketable debt securities, Unrealized Losses 7.3 0.4
Marketable debt securities, Fair Value 440.1 432.5
U.S. corporate securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 212.0 208.3
Marketable debt securities, Unrealized Gains   0.6
Marketable debt securities, Unrealized Losses 6.9 1.5
Marketable debt securities, Fair Value 205.1 207.4
U.S. taxable municipal/ provincial bonds    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 181.6 192.2
Marketable debt securities, Unrealized Gains 0.1 0.6
Marketable debt securities, Unrealized Losses 6.4 1.2
Marketable debt securities, Fair Value 175.3 191.6
U.S. government and agency securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 89.4 95.9
Marketable debt securities, Unrealized Gains 0.1 0.6
Marketable debt securities, Unrealized Losses 1.1 0.1
Marketable debt securities, Fair Value 88.4 96.4
Non-U.S. corporate securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 441.1 443.9
Marketable debt securities, Unrealized Gains 0.1 1.4
Marketable debt securities, Unrealized Losses 10.1 2.5
Marketable debt securities, Fair Value 431.1 442.8
Non-U.S. government securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 72.1 75.2
Marketable debt securities, Unrealized Gains   0.1
Marketable debt securities, Unrealized Losses 1.4 0.3
Marketable debt securities, Fair Value 70.7 75.0
Other debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 100.8 100.4
Marketable debt securities, Unrealized Gains 0.1 0.3
Marketable debt securities, Unrealized Losses 3.0 0.7
Marketable debt securities, Fair Value $ 97.9 $ 100.0