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
Pretax income (loss)
U.S.									$ 516.3	$ 580.1	$ 273.5
International									28.6	(60.6)	0.5
Income before income taxes and non-controlling interest	144.7	155.1	101.3	143.8	89.3	112.0	234.8	83.4	544.9	519.5	274.0
Current
Federal									154.6	167.9	69.6
State and local									32.8	25.7	10.4
International									15.8	12.9	9.4
Total current									203.2	206.5	89.4
Deferred
Federal									(6.0)	(3.2)	11.0
State and local									(0.6)	(4.7)	0.4
International									(4.3)	(3.1)	(5.0)
Total deferred									(10.9)	(11.0)	6.4
Total provision for income taxes	60.7	58.2	22.8	50.6	51.4	26.1	89.9	28.1	192.3	195.5	95.8
Differences between the Company's effective income tax rate and the U.S. federal income tax statutory rate
Provision for income taxes using the statutory rate in effect									190.5	181.8	95.9
Tax effect of:
State and local income taxes, net									6.1	6.6	7.0
International income taxes, net									2.4	25.8	1.8
Earnings of U.S. unconsolidated affiliates									(2.3)	(2.9)	(2.8)
Valuation allowance									(1.7)	3.0	1.8
Tax credits									(4.9)	(20.3)	(10.5)
Uncertain tax positions									15.9	15.0	7.7
Dividend received deduction									(2.5)	(3.0)	(2.2)
Domestic production activities deduction									(17.3)	(9.7)	(6.9)
Repatriation									7.5	0.6	2.0
Other									(1.4)	(1.4)	2.0
Total provision for income taxes	$ 60.7	$ 58.2	$ 22.8	$ 50.6	$ 51.4	$ 26.1	$ 89.9	$ 28.1	$ 192.3	$ 195.5	$ 95.8
Effective income tax rate (as a percent)									35.30%	37.60%	35.00%
Statutory federal income tax rate (as a percent)									35.00%	35.00%	35.00%