Acquisitions (Details) - USD ($) $ in Millions		9 Months Ended
	Apr. 17, 2015	Sep. 30, 2015	Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase of businesses, net of cash acquired		$ 25.4	$ 130.4
Finite-lived intangible assets acquired		9.6
Goodwill acquired in acquisition		21.8
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 4.1
Farmer Automatic [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase of businesses, net of cash acquired	$ 17.9
Cash acquired from acquisition	0.1
Finite-lived intangible assets acquired	9.6
Goodwill acquired in acquisition	10.0
Farmer Automatic [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 4.1
Finite-lived intangible assets acquired, weighted average useful life	10 years
Farmer Automatic [Member] | Technology-Based Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 3.6
Finite-lived intangible assets acquired, weighted average useful life	10 years
Farmer Automatic [Member] | Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 1.9
Finite-lived intangible assets acquired, weighted average useful life	10 years