Acquisitions Acquisitions - Liquid Fence (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			3 Months Ended	9 Months Ended			9 Months Ended
	Jun. 30, 2014	Sep. 30, 2013	Jan. 02, 2014 The Liquid Fence Company [Member]	Jun. 30, 2014 The Liquid Fence Company [Member]	Jun. 30, 2014 Technology assets [Member] The Liquid Fence Company [Member]	Jan. 02, 2014 Technology assets [Member] The Liquid Fence Company [Member]	Jan. 02, 2014 Trade names [Member] The Liquid Fence Company [Member]	Jun. 30, 2014 Customer relationships [Member] The Liquid Fence Company [Member]	Jan. 02, 2014 Customer relationships [Member] The Liquid Fence Company [Member]
Business Acquisition [Line Items]
Document Period End Date	Jun. 30, 2014
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					17 years			15 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						$ 20.5	$ 5.1		$ 1.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			0
Payments to Acquire Businesses, Gross	1.5			24.8
Business Combination, Consideration Transferred, Liabilities Incurred				9.5
Business Combination, Consideration Transferred, Other				1.5
Business Combination, Consideration Transferred				35.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables			1.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory			2.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			0.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			26.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			30.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			1.6
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			28.8
Goodwill	1,539.1	1,476.7	7.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest			35.8
Business Combination, Liabilities Arising from Contingencies, Amount Recognized			$ 1.5