Goodwill and intangibles, net - Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Balance at October 1, 2013	$ 1,475.8	$ 1,475.8
Cumulative translation adjustment	1.5
Balance at December 31, 2013	1,477.3	1,475.8
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,748.9
Household Products [Member]
Goodwill [Roll Forward]
Balance at October 1, 2013		37.2
Cumulative translation adjustment	0.1
Balance at December 31, 2013	37.3	37.2
Indefinite-Lived Intangible Assets (Excluding Goodwill)	80.7
Personal Care [Member]
Goodwill [Roll Forward]
Balance at October 1, 2013		1,438.6
Cumulative translation adjustment	1.4
Balance at December 31, 2013	1,440.0	1,438.6
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 1,668.2