Income Taxes (Income Tax (Benefit) Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax expense (benefit):
U.S. federal									$ 6.2	$ 19.0	$ (8.2)
State									4.8	1.4	3.4
Non-U.S.									45.0	16.5	5.9
Total current tax expense									56.0	36.9	1.1
Deferred tax expense (benefit):
U.S. federal									(13.6)	24.4	55.5
State									0	0	0
Non-U.S.									10.9	15.3	(72.3)
Total deferred tax (benefit) expense									(2.7)	39.7	(16.8)
Total income tax expense (benefit)	$ (8.7)	$ 7.8	$ 23.9	$ 30.3	$ 27.4	$ 8.2	$ (0.6)	$ 41.6	$ 53.3	$ 76.6	$ (15.7)