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Debt (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
April 2011 Line of Credit [Member]
 
Debt Instrument [Line Items]  
Line of Credit Facility, Maximum Amount Outstanding During Period $ 150
Line of Credit Facility, Remaining Borrowing Capacity 445
Senior Notes due 2022 at a fixed interest rate of 3.75% [Member]
 
Debt Instrument [Line Items]  
Debt Instrument, Issuance Date March 2012
Debt Instrument, Interest Rate, Stated Percentage 3.75%
Debt Instrument, Maturity Date, Description 2022
Debt Instrument, Face Amount 325.0
Senior Exchangeable Notes due 2015 at a fixed interest rate of 4.50% [Member]
 
Debt Instrument [Line Items]  
Debt Instrument, Issuance Date August 2009
Debt Instrument, Interest Rate, Stated Percentage 4.50%
Debt Instrument, Maturity Date, Description 2015
Debt Instrument, Face Amount 172.5
Debt Instrument, Exchange Feature, Exchange Period, End Date Jun. 30, 2012
Debt Instrument, Exchange Feature, Description Per the indenture, in order for the notes to become exchangeable, the Company's stock price must exceed 130 percent of the exchange price for 20 trading days in a period of 30 consecutive trading days as of the last day of the quarter.
Debt Instrument, Debt Maturing in Less than One Year, Classified as Long-term Debt $ 145.1