Income Taxes - Components of Income Tax (Expense) Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current (Expense) Benefit:
U.S.	$ (7.9)	$ (7.5)	$ (1.4)
International	(12.5)	(4.8)	(3.3)
Total Current	(20.4)	(12.3)	(4.7)
Deferred (Expense) Benefit:
U.S.	(110.6)	(35.0)	(65.3)
International	0.6	1.9	2.6
Total Deferred	(110.0)	(33.1)	(62.7)
Income Tax (Expense) Benefit	$ (130.4)	$ (45.4)	$ (67.4)