Acquisitions (Schedule of Finite-Lived Intangible Assets Acquired, Business Acquisitions - Pacer) (Details) - Pacer [Member] $ in Millions	Jun. 01, 2014 USD ($)
Business Combinations [Line Items]
Finite-lived intangible assets, weighted average useful life (in years)	6 years
Backlog [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, weighted average useful life (in years)	3 years
Non-Compete Agreements [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, weighted average useful life (in years)	9 years
Customer Relationships [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, weighted average useful life (in years)	8 years
Canadian Dollars [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	$ 19.4
Canadian Dollars [Member] | Backlog [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	6.1
Canadian Dollars [Member] | Non-Compete Agreements [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	2.3
Canadian Dollars [Member] | Customer Relationships [Member]
Business Combinations [Line Items]
Finite-lived intangible assets, fair value (in dollars)	$ 11.0