Note 7 - Pension, Post-Retirement and Post-Employment Plans (Details) - Major Categories of Assets in Company’s Defined Benefit Pension Plans (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Asset Category
Major categories of assets	$ 228.5		$ 215.2
Private Equity Funds, Domestic [Member] | Fair Value, Inputs, Level 1 [Member]
Asset Category
Major categories of assets	28.9		23.2
Private Equity Funds, Domestic [Member]
Asset Category
Major categories of assets	28.9		23.2
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Asset Category
Major categories of assets	9.2
Fixed Income Securities [Member]
Asset Category
Major categories of assets	9.2
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Asset Category
Major categories of assets	11.8		11.8
US Treasury Securities [Member]
Asset Category
Major categories of assets	11.8		11.8
Mutual Funds Holding Domestic Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Asset Category
Major categories of assets	4.8		4.2
Mutual Funds Holding Domestic Securities [Member]
Asset Category
Major categories of assets	4.8		4.2
Limited Partnership Interests [Member] | Fair Value, Inputs, Level 1 [Member]
Asset Category
Major categories of assets		[1]		[1]
Limited Partnership Interests [Member] | Fair Value, Inputs, Level 2 [Member]
Asset Category
Major categories of assets	77.1	[1]	82.4	[1]
Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Asset Category
Major categories of assets		[1]		[1]
Limited Partnership Interests [Member]
Asset Category
Major categories of assets	77.1	[1]	82.4	[1]
Designated Benefit Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Asset Category
Major categories of assets		[2]		[2]
Designated Benefit Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Asset Category
Major categories of assets	1.1	[2]	1.5	[2]
Designated Benefit Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Asset Category
Major categories of assets		[2]		[2]
Designated Benefit Fund [Member]
Asset Category
Major categories of assets	1.1	[2]	1.5	[2]
Insurance Buy In Policy [Member] | Fair Value, Inputs, Level 3 [Member]
Asset Category
Major categories of assets	83.2
Insurance Buy In Policy [Member]
Asset Category
Major categories of assets	83.2
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Asset Category
Major categories of assets	12.4		8.4
Cash and Cash Equivalents [Member]
Asset Category
Major categories of assets	12.4		8.4
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Asset Category
Major categories of assets			10.9
Equity Securities [Member]
Asset Category
Major categories of assets			10.9
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]
Asset Category
Major categories of assets			72.8
Real Estate [Member]
Asset Category
Major categories of assets			72.8
Fair Value, Inputs, Level 1 [Member]
Asset Category
Major categories of assets	57.9		47.6
Fair Value, Inputs, Level 2 [Member]
Asset Category
Major categories of assets	87.4		167.6
Fair Value, Inputs, Level 3 [Member]
Asset Category
Major categories of assets	$ 83.2

[1] This category represents limited partner investments with general partners that invest in equity securities.

[2] This category includes assets held in a fund with the Bank of Taiwan as prescribed by the Taiwan government in accordance with local statutory rules.