Fair Value Measurements Unobservable Inputs Rollforward (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent Consideration	$ 24.3
The amount of total losses for the period included in net loss attributable to the fair value of changes in assets still held	0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			2.0	0.7
Total realized/unrealized gains (losses) Included in other comprehensive income	2.0	0.3
Ending balance	$ 4.0	$ 1.0	$ 2.0	$ 0.7