Fair Value Measurements (Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2013	Sep. 30, 2013		Sep. 30, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ (24.7)	$ (24.7)		$ (90.3)
Total unrealized gains (losses) included in earnings		(3.1)	[1]	(11.9)	[1]
Acquisitions, sales, redemptions and maturities		(22.4)		67.3
Ending Balance		(50.2)		(34.9)
Fair Value Assets And Liabilities Measured On Recurring Basis Unrealized Gain Loss Included In Earnings	(3.1)
Contingent Consideration Related to Acquisitions [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	(24.9)	(24.9)		(90.8)
Total unrealized gains (losses) included in earnings		(3.1)	[1]	(11.5)	[1]
Acquisitions, sales, redemptions and maturities		(22.4)		67.3
Ending Balance		(50.4)		(35.0)
Fair Value Assets And Liabilities Measured On Recurring Basis Unrealized Gain Loss Included In Earnings	(3.1)
Suntech Warrant [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	0.2	0.2		0.5
Total unrealized gains (losses) included in earnings		0	[1]	(0.4)	[1]
Acquisitions, sales, redemptions and maturities		0		0
Ending Balance		0.2		0.1
Fair Value Assets And Liabilities Measured On Recurring Basis Unrealized Gain Loss Included In Earnings	$ 0

[1] Amounts included in earnings are recorded to non-operating expense (income) in the condensed consolidated statement of operations, except for the amount included in marketing and administration for the contingent consideration related to acquisitions, for which changes to the fair value were recorded to operating income (loss) in the condensed consolidated statement of operations.