Acquisitions (Schedule of Business Acquisition Amortizing Intangible Assets Acquired) (Details) (Pacer [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Jun. 01, 2014	Jun. 01, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets		$ 19.6
Finite-lived intangible asset, useful life	7 years
Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets		5.4
Finite-lived intangible asset, useful life	2 years
Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets		2.3
Finite-lived intangible asset, useful life	8 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets		$ 11.9
Finite-lived intangible asset, useful life	9 years