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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 2,660.0 $ 2,921.9 $ 3,156.9
Other comprehensive income (loss) 122.7 (125.7) (68.0)
Ending balance 2,794.6 2,660.0 2,921.9
Foreign currency translation adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (18.8) (18.2) (12.4)
Other comprehensive income (loss) 3.7 (0.6) (5.8)
Ending balance (15.1) (18.8) (18.2)
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 0.0 2.6
Other comprehensive income (loss) 0.0 0.0 0.0
Ending balance 0.0 0.0 0.0
Net unrealized gain (loss) on cash flow hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (187.2) (62.1) 0.1
Other comprehensive income (loss) 119.0 (125.1) (62.2)
Ending balance (68.2) (187.2) (62.1)
Accumulated other comprehensive loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (206.0) (80.3) (9.7)
Other comprehensive income (loss) 122.7 (125.7) (68.0)
Ending balance $ (83.3) $ (206.0) (80.3)
Cumulative effect of accounting changes      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance     18.7
Cumulative effect of accounting changes | Foreign currency translation adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Other comprehensive income (loss)     0.0
Cumulative effect of accounting changes | Net unrealized gain (loss) on available-for-sale securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Other comprehensive income (loss)     (2.6)
Cumulative effect of accounting changes | Net unrealized gain (loss) on cash flow hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Other comprehensive income (loss)     0.0
Cumulative effect of accounting changes | Accumulated other comprehensive loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance     (2.6)
Other comprehensive income (loss)     $ (2.6)