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Income taxes - statements of operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income (loss) before income taxes:      
United States $ 555.0 $ (2.6) $ 26.0
Foreign 198.0 64.9 14.6
Income before income taxes 753.0 62.3 40.6
Current income tax (expense) benefit      
Federal (74.0) 30.4 (36.6)
State (32.3) (4.8) (15.3)
Foreign (91.8) (58.8) (57.6)
Subtotal (198.1) (33.2) (109.5)
Deferred income tax (expense) benefit      
Federal (11.6) 28.0 28.9
State (1.9) 14.4 19.4
Foreign 31.2 45.1 58.4
Subtotal 17.7 87.5 106.7
Income tax (expense) benefit $ (180.4) $ 54.3 $ (2.8)