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Additional Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Apr. 01, 2017
Apr. 02, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]            
Cash and Cash Equivalents $ 1,111.6   $ 1,111.6   $ 668.3  
Restricted Cash, Current 13.3   13.3   9.8  
Restricted Cash, Noncurrent 34.0   34.0   33.7  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 1,158.9 $ 480.2 1,158.9 $ 480.2 $ 711.8 $ 502.1
Cash Interest and Taxes            
Cash paid for interest 3.0 3.2 5.6 6.8    
Cash paid for income taxes $ 7.5 $ 32.8 28.3 50.3    
Additional Financial Information (Textual) [Abstract]            
Capital expenditures incurred but not yet paid     37.5 58.6    
Capital lease asset recognized     2.3 5.2    
Capital Lease Obligations Incurred     $ 2.3 $ 5.2