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Additional Financial Information (Other Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Mar. 31, 2017
Other current assets    
Prepaid expenses and other $ 48.9 $ 26.1
Product inventory 21.4 23.9
Tax credits receivable 145.9 145.9
Other current assets 216.2 195.9
Other non-current assets    
Prepaid expenses and other [1] 26.6 39.9
Accounts receivable 282.5 313.1
Tax credits receivable 111.1 119.8
Other non-current assets $ 420.2 472.8
Notes receivable associated with a cost method investment   $ 21.7
[1] As of March 31, 2017, the non-current portion of prepaid expenses and other included $21.7 million of notes receivable associated with a cost method investment which were written down to their estimated fair value in the three months ended December 31, 2017 (see Note 4).