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Additional Financial Information (Other Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Mar. 31, 2017
Other current assets    
Prepaid expenses and other $ 23.1 $ 26.1
Product inventory 21.6 23.9
Tax credits receivable 164.9 145.9
Other current assets 209.6 195.9
Other non-current assets    
Prepaid expenses and other 40.9 39.9
Accounts receivable 305.6 313.1
Tax credits receivable 99.7 119.8
Other non-current assets $ 446.2 $ 472.8