Acquisitions (Schedule of Finite-Lived Intangible Assets Acquired, Business Acquisitions) (Details) (Pacer [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Jun. 01, 2014	Jun. 01, 2014
Finite-Lived Intangible Assets Acquired [Line Items]
Finite-lived intangible assets		$ 20.3
Finite-lived intangible assets, weighted average useful life	6 years
Backlog [Member]
Finite-Lived Intangible Assets Acquired [Line Items]
Finite-lived intangible assets		6.1
Finite-lived intangible assets, weighted average useful life	2 years
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets Acquired [Line Items]
Finite-lived intangible assets		2.3
Finite-lived intangible assets, weighted average useful life	8 years
Customer Relationships [Member]
Finite-Lived Intangible Assets Acquired [Line Items]
Finite-lived intangible assets		$ 11.9
Finite-lived intangible assets, weighted average useful life	8 years