Income Taxes (Current And Non-Current Deferred Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Current Asset	$ 55.9	$ 77.8
Non-Current Asset	60.0	67.1
Current (Liability)	(67.5)	(5.1)
Non-Current (Liability)	(57.9)	(111.9)
Total	(9.5)	27.9
United States
Income Taxes [Line Items]
Current Asset	38.8
Non-Current Asset	51.7
Total	90.5
Brazil
Income Taxes [Line Items]
Current Asset	10.6
Non-Current (Liability)	(13.8)
Total	(3.2)
Norway
Income Taxes [Line Items]
Current (Liability)	(65.3)
Non-Current (Liability)	(8.6)
Total	(73.9)
Other foreign
Income Taxes [Line Items]
Current Asset	6.5
Non-Current Asset	8.3
Current (Liability)	(2.2)
Non-Current (Liability)	(35.5)
Total	$ (22.9)

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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- Definition

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