Financing Arrangements (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Jun. 18, 2010	Apr. 27, 2006	May. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Financing Arrangements
Long-term Debt, Total				$ 577.3	$ 579.7
Less Current Maturities				1.1	1.9
Long-term debt, net of current portion				576.2	577.8
Principal payments during each of the next five years and thereafter
2016				226.1
2017				23.7
2018				22.5
2019				30.0
2020				105.0
Thereafter				170.0
Letters of credit outstanding				$ 24.8	23.6
5.85% Senior notes due 2016
Financing Arrangements
Interest rate (as a percent)		5.85%		5.85%
Long-term Debt, Total				$ 225.0	225.0
Principal amount of notes issued		$ 225.0
Principal payments during each of the next five years and thereafter
2016				225.0
5.85% Senior notes due 2016 | Minimum
Financing Arrangements
Optional amount that the Company may prepay				$ 1.0
5.47% notes due May 2013
Financing Arrangements
Interest rate (as a percent)			5.47%
Repayments of Debt			$ 75.0
5.05% Senior notes due 2020
Financing Arrangements
Interest rate (as a percent)	5.05%			5.05%
Long-term Debt, Total				$ 75.0	75.0
Principal amount of notes issued	$ 75.0
5.05% Senior notes due 2020 | Minimum
Financing Arrangements
Optional amount that the Company may prepay				1.0
Line of Credit matures on 2019
Financing Arrangements
Long-term Debt, Total				$ 275.0	275.0
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%
Long-term Debt, Total				$ 2.3	$ 4.7
Letters of credit
Financing Arrangements
Term of letters of credit from the date of issuance				1 year