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Segment Information (Revenue and Long-Lived Assets by Geographic Location) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 3,604.3 $ 3,271.5 $ 3,890.0
Long-Lived Assets 3,265.5 2,441.9  
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 56.8 43.3 43.9
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 3,016.8 2,863.3 3,321.9
Long-Lived Assets 3,101.3 2,279.7  
Other Foreign      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 530.7 364.9 $ 524.2
Long-Lived Assets $ 164.2 $ 162.2