Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
U.S. federal income taxes (including foreign withholding taxes):
Current federal income taxes									$ 46.9	$ 9.4	$ 0.9
Deferred federal income taxes									25.2	118.1	92.3
Total federal income taxes									72.1	127.5	93.2
State and local income taxes:
Current state and local income taxes									(14.7)	17.1	12.3
Deferred state and local income taxes									24.7	25.3	11.3
Total state and local income taxes									10.0	42.4	23.6
Foreign income taxes:
Current foreign income taxes									79.6	83.2	93.1
Deferred foreign income taxes									19.5	(39.8)	(19.7)
Total foreign income taxes									99.1	43.4	73.4
Total provision for income taxes	$ 103.2	$ 28.4	$ 62.0	$ (12.4)	$ 140.5	$ 41.9	$ 50.1	$ (19.2)	$ 181.2	$ 213.3	$ 190.2