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Noncontrolling interests (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]    
Noncontrolling interests, beginning $ 23.8 $ 24.6
Net income (loss) attributable to noncontrolling interests 1.3 (0.8)
Distributions to noncontrolling interests (0.5) 0.0
Noncontrolling interests, ending $ 24.6 $ 23.8