Income Taxes (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Balance at beginning of year	$ 93.5	$ 75.0	$ 78.5
Additions based on tax positions related to the current year	15.9	7.3	5.4
Additions for tax positions of prior years	18.3	14.4	3.1
Reductions for tax positions of prior years	(24.3)	(2.2)	(11.1)
Settlements		(0.4)	(0.1)
Statute expirations	(2.2)	(0.6)	(0.8)
Balance at end of year	101.2	93.5	75.0
Net unrecognized tax benefit that would affect the effective tax rate	63.0	49.9	44.0
Interest and penalties accrued, associated with unrecognized tax benefit	13.3
Interest and penalties liability increase	1.9	1.8
Resolution of federal income tax refund claims of research and experimentation credits	(16.0)
Estimated minimum federal income tax refund claims for domestic manufacturing deduction, greater than	10
Resolution of federal income tax refund claims of domestic manufacturing deduction	$ (2.3)