Derivatives and Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Summary of carrying and estimated fair values of the Company's financial instruments
Cash equivalents	$ 33.5	$ 61.3	$ 46.4	$ 62.2
Receivables less provision for allowances, claims and doubtful accounts	536.6	515.8
Accounts payable	282.4	245.0
Total debt	1,017.4	1,023.6
Carrying Amount [Member]
Summary of carrying and estimated fair values of the Company's financial instruments
Cash equivalents	33.5	61.3
Receivables less provision for allowances, claims and doubtful accounts	536.6	515.8
Accounts payable	282.4	245.0
Total debt	1,017.4	1,023.6
Fair Value [Member]
Summary of carrying and estimated fair values of the Company's financial instruments
Cash equivalents	33.5	61.3
Receivables less provision for allowances, claims and doubtful accounts	536.6	515.8
Accounts payable	282.4	245.0
Long-term debt, including current portion, Fair Value	$ 1,017.0	$ 1,020.0