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Additional Financial Information (Other Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Other current assets    
Prepaid expenses and other $ 34.1 $ 26.1
Product inventory 20.3 23.9
Tax credits receivable 141.4 145.9
Other current assets 195.8 195.9
Other non-current assets    
Prepaid expenses and other 23.8 39.9
Accounts receivable [1] 325.2 313.1
Tax credits receivable 109.6 119.8
Other non-current assets 458.6 472.8
Unamortized discount on long-term receivable $ 18.0 $ 17.6
[1] Unamortized discounts on long-term, non-interest bearing receivables were $18.0 million and $17.6 million at March 31, 2018 and 2017, respectively.