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Segment Information (Revenue and Long-Lived Assets by Geographic Location) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 4,016.9 $ 3,854.8 $ 3,604.3
Long-Lived Assets 3,239.5 3,206.4  
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 76.9 63.1 56.8
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 3,140.1 3,129.8 3,016.8
Long-Lived Assets 3,063.2 3,023.5  
Other Foreign      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 799.9 661.9 $ 530.7
Long-Lived Assets $ 176.3 $ 182.9