Goodwill and intangibles, net - Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
Goodwill [Roll Forward]
Balance at October 1, 2012	$ 1,469.5
Cumulative translation adjustment	3.8
Balance at December 31, 2012	1,473.3
Household Products [Member]
Goodwill [Roll Forward]
Balance at October 1, 2012	37.3
Cumulative translation adjustment	0
Balance at December 31, 2012	37.3
Personal Care [Member]
Goodwill [Roll Forward]
Balance at October 1, 2012	1,432.2
Cumulative translation adjustment	3.8
Balance at December 31, 2012	$ 1,436.0