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Credit Arrangements (Details) - USD ($)
Jul. 02, 2019
Dec. 31, 2018
Dec. 31, 2019
Line of Credit Facility [Line Items]      
Long-term Debt   $ 70,000,000.0 $ 513,100,000
Long-term debt   70,000,000.0 502,100,000
Remaining borrowing capacity     230,000,000.0
Long-term Debt, Current Maturities   0 11,000,000.0
Long-term Debt, Excluding Current Maturities   $ 70,000,000.0 502,100,000
London Interbank Offered Rate (LIBOR) [Member] | Credit agreement [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt   1.00%  
Medium-term Notes [Member] | Term Loan Facility [Member]      
Line of Credit Facility [Line Items]      
Long-term Debt   $ 0 443,100,000
Maximum borrowing capacity $ 450,000,000.0    
Line of Credit [Member] | Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 750,000,000.0    
Debt covenant, consolidated interest coverage ratio 3.00    
Line of Credit [Member] | Credit Agreement [Member] | Maximum [Member]      
Line of Credit Facility [Line Items]      
Debt covenant, consolidated leverage ratio 3.75    
Line of Credit [Member] | Credit Agreement [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt 1.50%    
Line of Credit [Member] | Credit Agreement [Member] | Maximum [Member] | Lender's base rate [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt 0.50%    
Line of Credit [Member] | Credit Agreement [Member] | Minimum [Member]      
Line of Credit Facility [Line Items]      
Debt covenant, consolidated leverage ratio 3.50    
Line of Credit [Member] | Credit Agreement [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt 1.00%    
Line of Credit [Member] | Credit Agreement [Member] | Minimum [Member] | Lender's base rate [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt 0.00%    
Line of Credit [Member] | July 2019 Revolving Credit Facility [Member] | Credit agreement [Member]      
Line of Credit Facility [Line Items]      
Long-term Debt   0 70,000,000.0
Maximum borrowing capacity $ 300,000,000.0    
Line of Credit [Member] | July 2019 Revolving Credit Facility [Member] | Letters of credit [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 50,000,000.0    
Line of Credit [Member] | Prior Revolving Credit Facility [Member] | Credit agreement [Member]      
Line of Credit Facility [Line Items]      
Long-term Debt   70,000,000.0 $ 0
Maximum borrowing capacity   300,000,000.0  
Line of Credit [Member] | Prior Revolving Credit Facility [Member] | Letters of credit [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   $ 25,000,000.0  
Line of Credit [Member] | Prior Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit agreement [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt   1.75%  
Line of Credit [Member] | Prior Revolving Credit Facility [Member] | Maximum [Member] | Lender's base rate [Member] | Credit agreement [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt   2.75%  
Line of Credit [Member] | Prior Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit agreement [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt   1.00%  
Line of Credit [Member] | Prior Revolving Credit Facility [Member] | Minimum [Member] | Lender's base rate [Member] | Credit agreement [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate debt   2.00%  
Line of Credit [Member] | July 2019 Revolving Credit Facility [Member] | Credit agreement [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 100,000,000.0