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Long-Term Debt And Short-Term Borrowings (Narrative) (Details)
€ in Millions, $ in Millions, $ in Millions
May 23, 2019
USD ($)
Jul. 26, 2018
USD ($)
Jan. 27, 2017
USD ($)
Sep. 30, 2021
Sep. 30, 2020
USD ($)
May 01, 2020
USD ($)
Apr. 30, 2020
Dec. 31, 2019
USD ($)
May 22, 2019
USD ($)
Jan. 27, 2017
EUR (€)
Jan. 27, 2017
AUD ($)
Debt Instrument [Line Items]                      
Total debt         $ 917.3     $ 816.0      
Five Year Senior Secured Credit Facility Maturing January 2022 [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Term     5 years                
Secured Debt | USD Senior Secured Term Loan A, due May 2024 (floating interest rate of 3.00% at September 30, 2020 and 3.44% at December 31, 2019)                      
Debt Instrument [Line Items]                      
Total debt $ 100.0       93.8     97.5      
Secured Debt | Euro Term Loan A                      
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount     $ 320.8             € 300.0  
Secured Debt | AUD Term Loan A                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity     60.4               $ 80.0
Senior Notes | Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%)                      
Debt Instrument [Line Items]                      
Total debt         375.0     $ 375.0      
Revolving Facility | Secured Debt                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity     $ 400.0                
Revolving Facility | Secured Debt | Senior Secured Credit Facility Due May 2024                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity 600.0                    
Line of Credit Facility, Increase (Decrease), Net $ 200.0                    
Total debt         123.7            
Amount available for borrowings under Senior Secured Revolving Credit Facilities         465.5            
Letters of credit outstanding         $ 10.8            
Revolving Facility | Secured Debt | Senior Secured Credit Facility Due January 2022                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   $ 500.0             $ 500.0    
Line of Credit Facility, Increase (Decrease), Net   $ 100.0                  
Senior Secured Credit Facility Due May 2024                      
Debt Instrument [Line Items]                      
Debt Instrument, Interest Rate, Increase (Decrease) (0.25%)                    
Senior Secured Credit Facility Due May 2024 | Secured Debt                      
Debt Instrument [Line Items]                      
Cash and Cash Equivalent Amount Maximum before Debt Instrument Requires Pay Down Revolving Facility           $ 100.0          
Senior Secured Credit Facility Due May 2024 | Secured Debt | Senior Secured Credit Facility Due May 2024                      
Debt Instrument [Line Items]                      
Debt Instrument, Minimum Leverage Ratio for Payments of Dividends or Repurchase of Shares 3.25                    
Senior Secured Credit Facility Due January 2022 | Secured Debt                      
Debt Instrument [Line Items]                      
Debt Instrument, Minimum Leverage Ratio for Payments of Dividends or Repurchase of Shares                 2.50    
Minimum | Senior Secured Credit Facility Due May 2024 | Secured Debt                      
Debt Instrument [Line Items]                      
Interest Coverage Ratio 3.00                    
Minimum | Senior Secured Credit Facility Due January 2022 | Secured Debt                      
Debt Instrument [Line Items]                      
Consolidated Fixed Charge Coverage Ratio                 1.25    
Maximum | Senior Secured Credit Facility Due May 2024 | Secured Debt                      
Debt Instrument [Line Items]                      
Debt Instrument, Covenant, Leverage Ratio           4.75 3.75        
Maximum | Senior Secured Credit Facility Due May 2024 | Secured Debt | Forecast [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Covenant, Leverage Ratio       3.75