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Comprehensive Income and Equity - Dividends Declared and Paid (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jul. 01, 2017
Apr. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Equity [Abstract]            
Cash dividends declared per share (in dollars per share) $ 0.70 $ 0.70 $ 0.50 $ 0.50 $ 1.40 $ 1.00
Dividends declared $ 47.0   $ 35.3   $ 94.7 $ 71.0
Dividends paid         $ 96.7 $ 70.7