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Noncontrolling interests (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]    
Noncontrolling interests, beginning $ 23.8 $ 24.6
Net income (loss) attributable to noncontrolling interests 2.2 (0.2)
Distributions (to) from noncontrolling interests (0.4) 0.4
Capital contributions from noncontrolling interests 0.8 0.0
Noncontrolling interests, ending $ 26.4 $ 24.8