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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of income before income taxes      
Domestic $ 238.6 $ 243.8 $ 186.3
International 256.6 208.9 192.6
Total 495.2 452.7 378.9
Reconciliation of effective income tax rate and rate applying the U.S. federal income tax rate      
Tax at U.S. federal income tax rate (as a percent) 35.00% 35.00% 35.00%
State income taxes, net of federal benefit (as a percent) 4.60% 2.40% 2.00%
Non-deductible expenses (as a percent) 0.80% 0.50% 0.10%
Valuation allowance (as a percent) (5.90%) (1.10%) 1.00%
Effect of foreign operations (as a percent) (2.90%)   0.50%
Foreign basis differences (as a percent) (0.40%) (0.90%) (0.70%)
Effect of changes in tax law, rates (as a percent) (2.00%) (2.10%) (1.20%)
Effect of income from non-controlling interests (as a percent) (12.20%) (13.20%) (12.50%)
Total effective income tax rate (as a percent) 17.00% 20.60% 24.20%
Increase (reduction) in valuation allowance due to foreign tax credit carryforwards 11.5   2.2
Deferred tax benefit due to re-valuation of deferred taxes from a change in enacted tax rates in the United Kingdom 7.3 7.6 4.1
Effect of changes in tax law, rates non-controlling interest (as a percent) 3.00% 3.10% 1.90%
Reversal of valuation allowance for state net operating losses 2.8 2.8  
Temporary difference due to repatriation of assets from a sale or liquidation of the subsidiary 25.8    
Amount of deferred taxes not recognized $ 9.8