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Financing (Narrative) (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
Dec. 31, 2013
USD ($)
Nov. 30, 2006
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 16, 2020
USD ($)
Apr. 16, 2020
EUR (€)
Oct. 23, 2018
USD ($)
Feb. 05, 2018
USD ($)
Mar. 02, 2015
USD ($)
Debt Instrument [Line Items]                          
Proceeds from issuance of short-term debt           $ 0 $ 0 $ 100,000,000.0          
Short-term borrowings   $ 149,400,000       375,700,000 149,400,000            
Long-term debt   842,000,000.0       $ 842,900,000 842,000,000.0            
Total debt to capitalization ratio           0.444              
Outstanding borrowings   842,000,000.0       $ 842,900,000 842,000,000.0            
Commercial Paper [Member]                          
Debt Instrument [Line Items]                          
Short-term borrowings   149,400,000         149,400,000            
Crane Currency [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, face amount   $ 150,000,000         $ 150,000,000            
4.45% Notes Due 2023 [Member]                          
Debt Instrument [Line Items]                          
Notes issued, term       10 years                  
Notes issued       $ 300,000,000                  
Debt instrument interest rate   4.45%   4.45%   4.45% 4.45%            
Percentage of principal amount Company may be required to buy back at       101.00%                  
Annualized interest rate including debt issuance cost amortization           4.56%              
Outstanding borrowings   $ 298,900,000       $ 299,100,000 $ 298,900,000            
6.55% Notes Due 2036 [Member]                          
Debt Instrument [Line Items]                          
Notes issued, term         30 years                
Notes issued         $ 200,000,000                
Debt instrument interest rate   6.55%     6.55% 6.55% 6.55%            
Percentage of principal amount Company may be required to buy back at         101.00%                
Annualized interest rate including debt issuance cost amortization           6.67%              
Outstanding borrowings   $ 198,300,000       $ 198,400,000 $ 198,300,000            
Senior Notes Due 2048 [Member]                          
Debt Instrument [Line Items]                          
Debt instrument interest rate   4.20%       4.20% 4.20%            
Outstanding borrowings   $ 346,100,000       $ 346,200,000 $ 346,100,000            
2017 Facility [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Covenant, Debt to Capital Ratio               0.65          
Debt Instrument, Covenant, Debt to Capital Ratio, maximum               1.00          
Three Hundred Sixty Four Day Credit Agreement | Line of Credit [Member]                          
Debt Instrument [Line Items]                          
Short-term borrowings   0       $ 348,500,000 0            
Debt instrument, face amount                 $ 300,000,000 € 40,000,000      
Base Rate [Member] | 2017 Facility [Member] | Minimum [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Basis Spread on Variable Rate     0.00%                    
Base Rate [Member] | 2017 Facility [Member] | Maximum [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Basis Spread on Variable Rate     0.50%                    
London Interbank Offered Rate (LIBOR) [Member] | 2017 Facility [Member] | Minimum [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Basis Spread on Variable Rate     0.805%                    
London Interbank Offered Rate (LIBOR) [Member] | 2017 Facility [Member] | Maximum [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Basis Spread on Variable Rate     1.50%                    
Senior Notes [Member] | Senior Notes Due 2048 [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                       $ 350,000,000  
Debt instrument interest rate                       4.20%  
Percentage of principal amount Company may be required to buy back at           101.00%              
Annualized interest rate including debt issuance cost amortization           4.29%              
Commercial Paper [Member]                          
Debt Instrument [Line Items]                          
Line of Credit Facility, Amended Maximum Borrowing Capacity                         $ 500,000,000
Proceeds from issuance of short-term debt $ 100,000,000 150,000,000                      
Short-term borrowings   149,400,000       $ 27,200,000 149,400,000            
Maximum borrowing capacity                     $ 550,000,000    
Letter of Credit [Member] | Line of Credit [Member] | Letter of Credit Reimbursement Agreement [Member]                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity   162,200,000       183,400,000 162,200,000            
Standby Letters of Credit [Member] | Line of Credit [Member]                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity   $ 48,100,000       $ 57,900,000 $ 48,100,000            
Revolving Credit Facility [Member] | Line of Credit [Member] | 2017 Facility [Member]                          
Debt Instrument [Line Items]                          
Line of Credit Facility, Amended Maximum Borrowing Capacity               $ 500,000,000          
Maximum borrowing capacity               $ 550,000,000