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Noncontrolling interests (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]    
Noncontrolling interests, beginning $ 23.8 $ 24.6
Net income (loss) attributable to noncontrolling interests 1.6 (1.2)
Distributions (to) from noncontrolling interests (0.4) 0.0
Capital contributions from noncontrolling interests 0.7 0.8
Noncontrolling interests, ending $ 25.7 $ 24.2