Debt (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 394.8	$ 411.5
Notes payable and other current debt	0.1	32.7
Long-term debt, excluding current portion	394.7	378.8
Senior C Notes, Due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	73.0	73.0
Senior B Notes, Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	53.0	53.0
Senior A Notes, Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	42.0	42.0
Revolving credit facility, due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	77.5	71.5
Line of credit facility classified as short-term		5.7
Line of credit facility, classified as long-term		65.8
Line of credit facility outstanding borrowings, Yen	5.1
Line of credit facility outstanding borrowings, Euro	27.4
Term Loan Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	42.2	35.3
Debt instrument, face amount	42.8
Debt Instrument Term	5 years 0 months 0 days
Debt Instrument, Description of Variable Rate Basis	one-month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.50%
Series B Floating Rate Notes Due 2015 [Member]
Debt Instrument [Line Items]
Long-term debt	25.0	25.0
EURO Note A Due 2013 [Member]
Debt Instrument [Line Items]
Long-term debt	0	26.9
EURO Note B Due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	79.6	80.8
Convertible Debt Due 2047 [Member]
Debt Instrument [Line Items]
Long-term debt	1.4	3.1
Aggregate principal amount repurchased	1.7
Interest rate (in hundredths)	4.00%
Loss on debt extinguishment	0.2
Term Loan Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt	0.2	0.2
Capital leases, due through 2016 [Member]
Debt Instrument [Line Items]
Capital leases	0.5	0.7
Notes Payable due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	0.4	0
$50M Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50.0