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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 2,921.9 $ 3,156.9
Other comprehensive loss (45.0) (11.2)
Ending balance 2,855.0 3,202.7
Foreign currency translation adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (18.2)  
Other comprehensive loss 0.9  
Ending balance (17.3)  
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 (45.9)  
Ending balance (108.0)  
Accumulated other comprehensive loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (80.3) (9.7)
Other comprehensive loss (45.0) (11.2)
Ending balance $ (125.3) $ (23.5)