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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes      
Unremitted earnings of foreign subsidiaries $ 186.7    
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits      
Balance at the beginning of the period 16.1 15.4 15.5
Increases in tax positions for prior years 0.6 1.3 0.3
Decreases in tax positions for prior years   (0.2) (0.9)
Increases in tax positions for current year 4.1 3.7 3.0
Settlements (1.1) (0.1) (0.3)
Lapses in statutes-of-limitation periods (3.8) (4.0) (2.2)
Balance at the end of the period 15.9 16.1 15.4
Unrecognized tax benefits, if recognized, would affect the effective tax rate 15.9    
Accrued interest and penalties on uncertain tax positions 0.9 1.1  
State
      
Income Taxes      
Available net operating loss carryforwards to offset future income taxes $ 4.9