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Segment and Geographical Area Information (External Revenue and Long-Lived Assets) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue $ 504.7 $ 470.4 $ 984.4 $ 927.4  
Long-lived assets 205.6   205.6   $ 199.4
United States          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 365.5 338.1 712.8 666.3  
Long-lived assets 172.2   172.2   165.6
Total International          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 139.2 132.3 271.6 261.1  
Long-lived assets 33.4   33.4   33.8
Canada          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 34.7 32.9 67.8 66.0  
Long-lived assets 7.2   7.2   5.4
Continental Europe          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 45.6 41.2 88.7 82.5  
Long-lived assets 7.4   7.4   8.5
Australia          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 14.6 14.7 29.0 28.7  
Long-lived assets 1.9   1.9   2.3
Canada          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 30.1 29.5 57.4 56.6  
Long-lived assets 4.4   4.4   4.5
United Kingdom          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 11.6 11.5 23.7 22.3  
Long-lived assets 12.3   12.3   12.8
Other          
Revenues from External Customers and Long-Lived Assets [Line Items]          
External revenue 2.6 $ 2.5 5.0 $ 5.0  
Long-lived assets $ 0.2   $ 0.2   $ 0.3