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Leases (Balance Sheet Information, Leases) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Operating Leases    
Operating Leases, Right-of-use assets $ 146.3 $ 0.0
Operating Lease, Liabilities 174.2  
Finance Leases    
Finance Lease, Liabilities $ 43.9 $ 45.4
Operating leases, weighted average remaining lease term 6 years 6 months  
Finance leases, weighted average remaining lease term 21 years 7 months 6 days  
Operating leases, weighted average discount rate, percent 4.11%  
Finance leases, weighted average discount rate, percent 6.41%  
Other Non-Current Assets    
Operating Leases    
Operating Leases, Right-of-use assets $ 146.3  
Accounts Payable and Accrued Liabilities    
Operating Leases    
Operating Leases, Liabilities, current 29.5  
Other Non-Current Liabilities    
Operating Leases    
Operating Leases, Liabilities, non-current 144.7  
Property and equipment, net    
Finance Leases    
Finance Leases, Right-of-Use assets 48.7  
Debt - short-term portion    
Finance Leases    
Finance Lease, Liabilities, Current 3.1  
Debt - non-current    
Finance Leases    
Finance Lease, Liabilities, Non-current $ 40.8