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Goodwill and Other Intangible Assets, Net - Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 102.1 $ 98.8
Accumulated Amortization (61.4) (51.6)
Net Carrying Amount 40.7 47.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021 9.8  
2022 8.9  
2023 5.9  
2024 4.6  
2025 4.2  
2026 and thereafter 7.3  
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 48.0 48.0
Accumulated Amortization (23.9) (20.0)
Net Carrying Amount 24.1 28.0
Non-competition agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 5.0 5.0
Accumulated Amortization (4.8) (4.4)
Net Carrying Amount 0.2 0.6
Trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3.8 3.8
Accumulated Amortization (3.8) (3.8)
Net Carrying Amount 0.0 0.0
Internally developed and other purchased software    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 45.3 42.0
Accumulated Amortization (28.9) (23.4)
Net Carrying Amount $ 16.4 $ 18.6