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Segment Information (Revenue and Long-Lived Assets by Geographic Location) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 3,854.8 $ 3,604.3 $ 3,271.5
Long-Lived Assets 3,206.4 3,265.5  
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 63.1 56.8 43.3
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 3,129.8 3,016.8 2,863.3
Long-Lived Assets 3,023.5 3,101.3  
Other Foreign      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 661.9 530.7 $ 364.9
Long-Lived Assets $ 182.9 $ 164.2