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Short-term and Long-term Debt - Short-term and Long-term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Schedule Of Debt Instruments [Line Items]    
Other debt $ 208.4 $ 160.2
Unsecured notes 250.0 150.0
Long-term debt including current maturities 1,208.4 1,010.2
Less: notes payable and current maturities of long-term debt:    
Current maturities of long-term debt (250.0) (150.0)
Commercial paper borrowings (170.0) (130.0)
Other notes (33.4) (21.4)
Notes payable and current maturities of long-term debt (453.4) (301.4)
Total long-term debt 755.0 708.8
Long-term debt including current maturities 1,208.4 1,010.2
5.50% Unsecured Notes Due 2017 [Member]    
Schedule Of Debt Instruments [Line Items]    
Unsecured notes   150.0
Less: notes payable and current maturities of long-term debt:    
Current maturities of long-term debt   (150.0)
4.25% Unsecured Notes Due 2018 [Member]    
Schedule Of Debt Instruments [Line Items]    
Unsecured notes 250.0 250.0
6.70% Unsecured Notes Due 2019 [Member]    
Schedule Of Debt Instruments [Line Items]    
Unsecured notes 200.0 200.0
6.125% Unsecured Notes Due 2021 [Member]    
Schedule Of Debt Instruments [Line Items]    
Unsecured notes 250.0 $ 250.0
3.25% Unsecured Notes Due 2027 [Member]    
Schedule Of Debt Instruments [Line Items]    
Unsecured notes $ 300.0