Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Deferred tax assets, non-deductible interest	$ 43.8	$ 29.2
Foreign tax credit carryforwards	$ 29.3	29.3
Foreign tax credit carryforwards, expiration date	Dec. 31, 2022
Foreign earnings taxable as dividend	$ 190.2	186.6	$ 196.2
Net operating loss carryforwards, expiration date	Dec. 31, 2018
Unrecognized tax benefits that would impact effective tax rate	$ 9.3	43.1	$ 41.7
Reasonably possible change in unrecognized tax benefits	9.7
Income tax expense (benefit), undistributed foreign earnings not indefinitely reinvested	1,532.2
Undistributed foreign earnings indefinitely reinvested	1,948.5
Income tax expense (benefit), repatriated foreign earnings	717.2
Income tax benefit from tax holidays	$ 29.3	$ 1.3
Income tax benefit from tax holidays (dollars per share)	$ 0.13	$ 0.01
Angola
Income Taxes [Line Items]
Open tax year	2010
Norway
Income Taxes [Line Items]
Open tax year	2006
Nigeria
Income Taxes [Line Items]
Open tax year	2007
Brazil
Income Taxes [Line Items]
Open tax year	2010
United States
Income Taxes [Line Items]
Open tax year	2012
Tax Year 2018 [Member] | Singapore
Income Taxes [Line Items]
Income tax holiday, termination year	12/31/2018
Tax year 2015 [Member] | Malaysia
Income Taxes [Line Items]
Income tax holiday, termination year	12/31/2017
Tax year 2018 [Member] | Malaysia
Income Taxes [Line Items]
Income tax holiday, termination year	12/31/2020