Acquisition (Details) - Plant Equipment Group [Member] - USD ($) $ in Millions		6 Months Ended
	Jan. 30, 2015	Jun. 30, 2015
Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 25.9
Escrow deposit to secure sellers' indemnification obligations	$ 1.9
Duration period of escrow deposit	1 year
Goodwill and other intangibles recorded	$ 5.8
Domain Names [Member]
Acquisition [Line Items]
Intangible assets acquired	4.1
Client Lists [Member]
Acquisition [Line Items]
Intangible assets acquired	2.1
Client Lists [Member] | Minimum [Member]
Acquisition [Line Items]
Intangible assets of weighted average useful life		5 years
Client Lists [Member] | Maximum [Member]
Acquisition [Line Items]
Intangible assets of weighted average useful life		10 years
Leases [Member]
Acquisition [Line Items]
Intangible assets acquired	$ 0.8
Leases [Member] | Minimum [Member]
Acquisition [Line Items]
Intangible assets of weighted average useful life		3 years
Leases [Member] | Maximum [Member]
Acquisition [Line Items]
Intangible assets of weighted average useful life		6 years