Acquisitions (Details 1) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Jul. 08, 2016	Jun. 30, 2016	Sep. 01, 2015
Business Acquisition Purchase Price Allocation Identifiable Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 63.9	$ 63.9
Lovejoy [Member]
Business Acquisition Purchase Price Allocation Identifiable Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 24.1
Lovejoy [Member] | Technology-Based Intangible Assets [Member]
Business Acquisition Purchase Price Allocation Identifiable Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		8.9
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	19 years
Lovejoy [Member] | Computer Software, Intangible Asset [Member]
Business Acquisition Purchase Price Allocation Identifiable Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0.1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Lovejoy [Member] | Customer Relationships [Member]
Business Acquisition Purchase Price Allocation Identifiable Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		11.1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Lovejoy [Member] | Non-compete agreements [Member]
Business Acquisition Purchase Price Allocation Identifiable Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0.2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Lovejoy [Member] | Off-Market Favorable Lease [Member]
Business Acquisition Purchase Price Allocation Identifiable Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0.1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years
Lovejoy [Member] | Trade name [Member]
Business Acquisition Purchase Price Allocation Identifiable Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		$ 3.7
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	0 years