Financing Arrangements - Long-term debt (Details) - USD ($) $ in Millions			12 Months Ended
	Apr. 28, 2016	Jun. 18, 2010	Dec. 31, 2016	Dec. 31, 2015
Financing Arrangements
Total debt			$ 653.6	$ 577.3
Less debt issuance costs (deduction from liability)			(3.2)	(2.0)
Less current maturities			(139.1)	(1.1)
Total long-term debt			511.3	574.2
Principal payments during each of the next five years and thereafter
2017			139.1
2018			22.5
2019			30.0
2020			105.0
2021			357.0
Letters of credit outstanding			$ 25.6	$ 24.8
5.85% Senior notes due 2016
Financing Arrangements
Interest rate (as a percent)	5.85%			5.85%
Total debt				$ 225.0
Repayments of Debt	$ 225.0
5.05% Senior notes due 2020
Financing Arrangements
Interest rate (as a percent)			5.05%	5.05%
Total debt			$ 75.0	$ 75.0
Amount drawn		$ 75.0
5.05% Senior notes due 2020 | Minimum
Financing Arrangements
Optional amount that the Company may prepay				1.0
Term Loan due February 2021
Financing Arrangements
Total debt			300.0
Term Loan due December 2017
Financing Arrangements
Total debt			115.8
Line of Credit matures February 2019
Financing Arrangements
Total debt				275.0
Line of Credit matures February 2021
Financing Arrangements
Total debt			$ 162.0
Other consists primarily of European borrowings (at interest rates ranging from 1.1% to 6.0%)
Financing Arrangements
Minimum interest rate (as a percent)			1.10%
Maximum interest rate (as a percent)			6.00%
Total debt			$ 0.8	$ 2.3
Letters of credit
Financing Arrangements
Term of letters of credit from the date of issuance			1 year