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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 97.7 $ 73.3 $ 175.4 $ 162.4
Pretax income before equity in net income of affiliates $ 443.6 $ 381.9 $ 891.4 $ 774.1
Effective tax rate 22.00% 19.20% 19.70% 21.00%