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Marketable Securities (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost $ 1,418.7  
Marketable debt securities, Fair Value 1,429.3  
Marketable equity securities, Cost 5.4  
Marketable equity securities, Unrealized Gains 0.0  
Marketable equity securities, Unrealized Losses 0.1  
Marketable equity securities, Fair Value 5.3  
Total marketable securities, Cost 1,424.1 $ 1,409.7
Total marketable securities, Unrealized Gains 11.8 19.4
Total marketable securities, Unrealized Losses 1.3 0.1
Total marketable securities, Fair Value 1,434.6 1,429.0 [1]
U.S. tax-exempt securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 445.6 388.1
Marketable debt securities, Unrealized Gains 3.1 4.4
Marketable debt securities, Unrealized Losses 0.1 0.1
Marketable debt securities, Fair Value 448.6 392.4
U.S. corporate securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 187.8 229.6
Marketable debt securities, Unrealized Gains 1.7 3.3
Marketable debt securities, Unrealized Losses 0.2  
Marketable debt securities, Fair Value 189.3 232.9
U.S. government and agency securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 79.2 92.1
Marketable debt securities, Unrealized Gains 1.3 2.3
Marketable debt securities, Fair Value 80.5 94.4
Non-U.S. corporate securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 420.0 406.0
Marketable debt securities, Unrealized Gains 3.2 5.5
Marketable debt securities, Unrealized Losses 0.7  
Marketable debt securities, Fair Value 422.5 411.5
Non-U.S. government securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 71.7 77.0
Marketable debt securities, Unrealized Gains 0.2 0.5
Marketable debt securities, Unrealized Losses 0.1  
Marketable debt securities, Fair Value 71.8 77.5
Other debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Marketable debt securities, Cost 214.4 216.9
Marketable debt securities, Unrealized Gains 2.3 3.4
Marketable debt securities, Unrealized Losses 0.1  
Marketable debt securities, Fair Value $ 216.6 $ 220.3
[1] The December 31, 2020 consolidated balance sheet has been derived from audited financial statements.