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Segment Information (Revenue and Long-Lived Assets by Geographic Location) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 3,271.5 $ 3,890.0 $ 3,680.5
Long-Lived Assets 2,441.9 1,797.5  
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 43.3 43.9 47.9
Long-Lived Assets 0.0 0.0  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 2,863.3 3,321.9 3,124.6
Long-Lived Assets 2,279.7 1,684.7  
Other Foreign      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 364.9 524.2 $ 508.0
Long-Lived Assets $ 162.2 $ 112.8