XML 90 R81.htm IDEA: XBRL DOCUMENT v3.19.1
Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Reconciliation of Unrecognized Tax Benefits      
Unrecognized tax benefits — beginning of year $ 12.2 $ 7.2 $ 3.2
Additions for tax positions of the current year 1.5 1.9 2.2
Additions for tax positions taken in prior years 0.6 4.6 2.3
Settlements with tax authorities/statute lapses (2.8) (1.5) (0.5)
Unrecognized tax benefits — end of year $ 11.5 $ 12.2 $ 7.2