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Revenue - Contracts and Liabilities (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Contract With Customer, Asset [Roll Forward]  
Contract assets, December 31, 2020 $ 10.9
Contract assets, September 30, 2021 12.8
Change in contract assets - increase (decrease) 1.9
Contract With Customer, Liability [Roll Forward]  
Deferred income, December 31, 2020 (57.1)
Deferred income, September 30, 2021 (38.1)
Change in deferred income - decrease (increase) $ 19.0