Income Taxes (Effective Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
U.S. statutory rate (as a percent)									35.00%
Tax (expense) benefit at the U.S. statutory rate									$ (54.2)	$ 10.2	$ (55.5)
Differences in taxes resulting from:
Non-U.S. earnings, net of foreign taxes									(76.7)	(37.8)	(75.1)
Change in valuation allowance									(18.7)	(36.0)	(49.9)
Withholding tax									(1.2)	(2.4)	(1.0)
Tax exempt interest and dividends									2.6	2.5	2.4
Tax reserve adjustments									(1.7)	5.2	(1.2)
Other, net									(2.8)	(2.5)	(2.5)
Income tax (expense) benefit	$ 1.5	$ 1.6	$ 2.2	$ (4.6)	$ 26.2	$ 4.7	$ (7.1)	$ (9.0)	0.7	14.8	(32.6)
Pre-tax loss	$ 258.1	$ (94.6)	$ (9.1)	$ 0.5	$ (65.7)	$ (35.5)	$ 33.6	$ 38.6	154.9	(29.0)	158.6
Tax Payments and Receipts
Net income tax payments to (receipts from) national governments, total									(6.5)	2.7	3.6
Non-US
Differences in taxes resulting from:
Pre-tax loss									$ 209.5	$ 60.4	$ 163.7