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Subsequent Events (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 05, 2018
Jan. 10, 2018
Feb. 28, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 07, 2018
Subsequent Event [Line Items]              
Acquisition-Related Costs       $ 7,800,000 $ 0 $ 0  
Crane Currency [Member]              
Subsequent Event [Line Items]              
Acquisition-Related Costs       4,200,000      
Crane Currency [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Payments to Acquire Businesses, Gross   $ 800,000,000          
Two point seven five Percent Notes Due 2018 [Member]              
Subsequent Event [Line Items]              
Debt Instrument, Face Amount       $ 250,000,000 $ 250,000,000    
Debt Instrument, Interest Rate, Stated Percentage       2.75%      
Long-term Debt       $ 250,000,000      
Two point seven five Percent Notes Due 2018 [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage             2.75%
Long-term Debt             $ 250,000,000
Senior Notes [Member] | Senior Notes Due 2048 [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Debt Instrument, Face Amount $ 350,000,000            
Debt Instrument, Interest Rate, Stated Percentage 4.20%            
Line of Credit [Member] | 364 Day Credit Agreement [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Repayments of Debt $ 100,000,000   $ 100,000,000