Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income before income taxes:
U.S.	$ 137.4	$ 106.3	$ 54.3
International	100.3	69.2	45.5
Total income before income taxes	237.7	175.5	99.8
Current:
U.S.	36.9	10.6	1.1
International	20.7	7.6	5.7
Current provision for income taxes	57.6	18.2	6.8
Deferred:
U.S.	10.4	24.4	15.1
International	6.1	(1.0)	1.0
Deferred provision (benefit) for income taxes	16.5	23.4	16.1
Total provision for income taxes	74.1	41.6	22.9
U.S. federal statutory income tax rate (as a percent)	35.00%
Reconciliation of provision for income taxes at U.S. federal statutory income tax rate to effective income tax rate
Provision for taxes at U.S. federal statutory rate	83.2	61.5	34.9
State and local taxes, net of federal benefit	2.2	2.2	1.8
Foreign effective rate differential	(10.3)	(8.4)	(7.3)
Other		1.3	1.4
Foreign Tax Credit Carryforward	(0.7)	(2.4)	(3.2)
U.S. Research & Development Tax Credits	0.5	(1.0)	(1.3)
Tax Settlement	0.2	(5.5)
Wind Energy Tax Credit		(0.1)	(3.5)
Change in valuation allowance	(1.0)	(6.0)	0.1
Total provision for income taxes	74.1	41.6	22.9
Tax benefits relating to reversal of valuation allowances and favorable impact of tax audit settlement		11.3
Assets
Net operating loss carryforwards	56.2	64.2
Unfunded pension liability and other postretirement obligations	15.3	13.8
Advanced payments from foreign affiliates	22.3	18.8
Tax credit carryforwards	35.4	21.0
Stock based compensation	12.6	11.3
Other comprehensive income	14.0	13.4
Reserves and other	14.7	14.7
Subtotal	170.5	157.2
Valuation allowance	(49.4)	(39.4)
Total assets	121.1	117.8
Liabilities
Accelerated depreciation	(50.1)	(39.4)
Accelerated amortization	(8.2)	(1.2)
Other	(0.2)	(0.4)
Total liabilities	(58.5)	(41.0)
Net deferred tax assets	62.6	76.8
Deferred tax assets and deferred tax liabilities as presented in consolidated balance sheets
Current deferred tax assets, net	62.5	45.1
Current deferred tax liability, net	(0.2)	(0.1)
Long-term deferred tax assets, net	15.4	33.0
Long-term deferred tax liability, net	(15.1)	(1.2)
Net deferred tax assets	$ 62.6	$ 76.8