Equity Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Equity method investment, sales reported on consolidated financial statements	$ 109.4	$ 111.7	$ 114.3
WAVE [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest percentage	50.00%
Distributions from equity interest	67.9	61.1	63.5
Equity method investment, difference between carrying amount and underlying equity	$ 177.7	$ 183.3
Customer Relationships [Member]
Schedule of Equity Method Investments [Line Items]
Amortizing intangible assets, Estimated Useful Life	20 years
Customer Relationships [Member] | WAVE [Member]
Schedule of Equity Method Investments [Line Items]
Amortizing intangible assets, Estimated Useful Life	20 years
Developed Technology [Member]
Schedule of Equity Method Investments [Line Items]
Amortizing intangible assets, Estimated Useful Life	15 years
Developed Technology [Member] | WAVE [Member]
Schedule of Equity Method Investments [Line Items]
Amortizing intangible assets, Estimated Useful Life	15 years
Trademarks [Member] | WAVE [Member]
Schedule of Equity Method Investments [Line Items]
Non-amortizing intangible assets, Estimated Useful Life	indefinite