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Reconciliation of Effective Income Tax Rate (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
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  | 35.00% |  | 35.00% |  | 35.00% |
Income tax provision at U.S. federal statutory rate |  |  |  |  |  |  |  |  | $ 163.8 |  | $ 236.2 |  | $ 258.4 |
State and local income taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  | 6.5 |  | 27.3 |  | 15.3 |
Impact of foreign operations, including withholding taxes |  |  |  |  |  |  |  |  | 30.5 |  | 8.4 |  | (21.9) |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  |  |  |  |  |  |  |  | 3.2 | [1] | (57.3) | [1] | (32.9) | [1]
Worthless securities deduction |  |  |  |  |  |  |  |  | (22.2) |  | 0 |  | (23.0) |
Increases (decreases) in unrecognized tax benefits, net |  |  |  |  |  |  |  |  | 0 |  | 24.1 |  | (2.7) |
Other |  |  |  |  |  |  |  |  | (0.6) |  | (25.4) |  | (3.0) |
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 |
Effective income tax rate on operations |  |  |  |  |  |  |  |  | 38.70% |  | 31.60% |  | 25.80% |
[1] | Reflects changes in valuation allowance that impacted the effective income tax rate for each year presented.

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