Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings before income taxes and the provision for income taxes
Earnings (loss) before income taxes	$ 175.0	$ 170.1	$ 194.7	$ 221.2	$ 185.4	$ 193.1	$ 217.1	$ 170.3	$ 761.0	$ 765.9	$ 477.9
Current:
Federal/foreign									245.9	194.7	131.7
State									3.4	1.7	2.2
Total current									249.3	196.4	133.9
Deferred									(10.7)	(1.1)	(52.2)
Provision for income taxes	48.4	64.2	68.5	57.5	58.2	46.4	49.8	40.9	238.6	195.3	81.7
Effective tax rate									31.40%	25.50%	17.10%
U.S. Federal
Earnings before income taxes and the provision for income taxes
Loss before income taxes - U.S.									132.3	119.2	(26.7)
Current:
Federal/foreign									59.8	31.8	14.0
State									3.4	1.7	2.2
Total current									63.2	33.5	16.2
Deferred									19.5	17.4	(48.9)
Provision for income taxes									82.7	50.9	(32.7)
Effective tax rate									62.50%	42.70%	(122.50%)
Non-U.S. Tax Jurisdiction
Earnings before income taxes and the provision for income taxes
Earnings before income taxes - Non-U.S.									628.7	646.7	504.6
Current:
Federal/foreign									186.1	162.9	117.7
State									0	0	0
Total current									186.1	162.9	117.7
Deferred									(30.2)	(18.5)	(3.3)
Provision for income taxes									$ 155.9	$ 144.4	$ 114.4
Effective tax rate									24.80%	22.30%	22.70%