Postemployment Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Profit Sharing Plan and 401 K [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Company Contribution Rate	5.00%
Defined Contribution Plan, Cost Recognized	$ 2.7	$ 2.5	$ 2.3
Multiemployer Plans, Postretirement Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan, Period Contributions	$ 3.7	$ 3.9	$ 4.3