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Employee benefit plans - changes to plan assets using unobservable inputs (Details) - Non-U.S. - Pension plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes to plan assets    
Beginning balance $ 132.3 $ 191.2
Currency translation (2.9) 11.8
Ending balance 147.2 132.3
Level 3    
Changes to plan assets    
Beginning balance 33.6 82.4
Purchases 3.1 6.4
Actual returns (0.3) 1.2
Settlements (2.9) (54.8)
Currency translation 0.1 (1.6)
Ending balance $ 33.6 $ 33.6