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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 2,855.0 $ 3,202.7 $ 2,921.9 $ 3,156.9
Other comprehensive loss (20.3) 7.9 (65.3) (3.3)
Ending balance 2,842.3 3,052.2 2,842.3 3,052.2
Foreign currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (18.2)  
Other comprehensive loss     1.4  
Ending balance (16.8)   (16.8)  
Net unrealized gain (loss) on cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (62.1)  
Other comprehensive loss     (66.7)  
Ending balance (128.8)   (128.8)  
Accumulated other comprehensive loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (125.3) (23.5) (80.3) (9.7)
Other comprehensive loss (20.3) 7.9 (65.3) (3.3)
Ending balance $ (145.6) $ (15.6) $ (145.6) $ (15.6)