Acquisitions And Divestitures (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Intangible asset useful life		16 years
Business Combination, Integration Related Costs		$ 0	$ 7,200,000	$ 9,800,000
Restructuring charges		0	7,800,000	29,200,000
Goodwill		$ 1,149,200,000	$ 1,167,900,000	1,191,300,000
2.75% Notes Due 2018 [Member]
Business Acquisition [Line Items]
Notes issued	$ 250,000,000
Debt instrument interest rate			2.75%
4.45% Notes Due 2023 [Member]
Business Acquisition [Line Items]
Notes issued	$ 300,000,000
Debt instrument interest rate			4.45%
Customer relationships [Member]
Business Acquisition [Line Items]
Intangible asset useful life		15 years 8 months 12 days
Acquisition Related Restructuring [Member]
Business Acquisition [Line Items]
Restructuring charges				$ 10,300,000