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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2018
Apr. 01, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance $ 2,921.9 $ 3,156.9 $ 2,514.4    
Cumulative effect of accounting changes       $ 18.7 $ 60.8
Other comprehensive income (loss) (125.7) (68.0) 6.3    
Ending balance 2,660.0 2,921.9 3,156.9    
Foreign currency translation adjustments          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (18.2) (12.4) (19.4)    
Cumulative effect of accounting changes       0.0  
Other comprehensive income (loss) (0.6) (5.8) 7.0    
Ending balance (18.8) (18.2) (12.4)    
Net unrealized gain (loss) on available-for-sale securities          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance 0.0 2.6 3.1    
Cumulative effect of accounting changes       (2.6)  
Other comprehensive income (loss) 0.0 0.0 (0.5)    
Ending balance 0.0 0.0 2.6    
Net unrealized gain (loss) on cash flow hedges          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (62.1) 0.1 0.3    
Cumulative effect of accounting changes       0.0  
Other comprehensive income (loss) (125.1) (62.2) (0.2)    
Ending balance (187.2) (62.1) 0.1    
Accumulated other comprehensive loss          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (80.3) (9.7) (16.0)    
Cumulative effect of accounting changes       $ (2.6)  
Other comprehensive income (loss) (125.7) (68.0) 6.3    
Ending balance $ (206.0) $ (80.3) $ (9.7)