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Recently Issued Accounting Standards Recently Issued Accounting Standards (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income tax benefit (provision) $ (47.4) $ (28.0) $ (74.7) $ (17.1)
Net cash provided by operating activities     437.0 232.6
Net cash used in financing activities     $ (109.8) (227.9)
Historical Licensing Business Percentage of Total Revenue     2.00%  
Accounting Standards Update 2016-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income tax benefit (provision) $ (5.5)   $ (15.5)  
Net cash provided by operating activities       0.3
Net cash used in financing activities       $ (0.3)