Goodwill And Other Intangible Assets (Intangible Assets Purchased) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 340.4	$ 320.8
Accumulated amortization	161.7	151.7
Net intangibles as of end of period	178.7	169.1
Acquired during period:
Acquired related to business acquisitions	28.9	20.3
Acquired outside business acquisitions	13.9	6.7
Total acquired in period	$ 42.8	$ 27.0
Weighted average amortization period in years for items acquired in period	11 years 7 months 6 days	8 years 7 months 18 days
Debt Issuance Costs
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 4.9	$ 3.7
Accumulated amortization	2.3	1.9
Net intangibles as of end of period	2.6	1.8
Acquired during period:
Acquired related to business acquisitions	0.0	0.0
Acquired outside business acquisitions	1.3	0.6
Total acquired in period	$ 1.3	$ 0.6
Weighted average amortization period in years for items acquired in period	5 years 18 days	5 years 18 days
Patents and Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 65.8	$ 65.3
Accumulated amortization	31.3	30.9
Net intangibles as of end of period	34.5	34.4
Acquired during period:
Acquired related to business acquisitions	2.7	8.7
Acquired outside business acquisitions	1.3	1.4
Total acquired in period	$ 4.0	$ 10.1
Weighted average amortization period in years for items acquired in period	16 years 6 months	2 years 8 months 18 days
Non-compete Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 15.8	$ 14.2
Accumulated amortization	8.6	6.7
Net intangibles as of end of period	7.2	7.5
Acquired during period:
Acquired related to business acquisitions	1.9	0.4
Acquired outside business acquisitions	0.6	0.0
Total acquired in period	$ 2.5	$ 0.4
Weighted average amortization period in years for items acquired in period	4 years 6 months	6 years 10 months 18 days
Customer- Related Intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 212.5	$ 210.1
Accumulated amortization	98.8	96.9
Net intangibles as of end of period	113.7	113.2
Acquired during period:
Acquired related to business acquisitions	19.4	11.2
Acquired outside business acquisitions	0.0	0.2
Total acquired in period	$ 19.4	$ 11.4
Weighted average amortization period in years for items acquired in period	14 years 4 months 24 days	16 years 4 months 18 days
Supply Agreements and Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 41.4	$ 27.5
Accumulated amortization	20.7	15.3
Net intangibles as of end of period	20.7	12.2
Acquired during period:
Acquired related to business acquisitions	4.9	0.0
Acquired outside business acquisitions	10.7	4.5
Total acquired in period	$ 15.6	$ 4.5
Weighted average amortization period in years for items acquired in period	7 years 3 months 18 days	3 years 18 days