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Additional Financial Information (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and Cash Equivalents $ 532.3   $ 1,304.6  
Restricted cash, current 8.0   15.5  
Restricted cash, noncurrent 35.5   35.4  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 575.8 $ 876.4 $ 1,355.5 $ 711.8
Cash Interest and Taxes        
Cash paid for interest 3.0 2.6    
Cash paid for income taxes 3.3 20.8    
Additional Financial Information (Textual) [Abstract]        
Capital expenditures incurred but not yet paid $ 29.1 $ 30.6