Derivatives and Fair Value Measurements - Carrying and Estimated Fair Values Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	$ 82.5	$ 74.0	$ 75.7	$ 70.8
Restricted Cash, Carrying Amount	1.9	1.8
Receivables less provision for allowances, claims and doubtful accounts, Carrying Amount	466.4	385.4
Accounts payable, Carrying Amount	319.3	207.2
Long-term debt, including current portion, Carrying Amount	1,254.8	1,294.8
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Fair Value	82.5	74.0
Restricted Cash, Fair Value	1.9	1.8
Receivables less provision for allowances, claims and doubtful accounts, Fair Value	466.4	385.4
Accounts payable, Fair Value	319.3	207.2
Long-term debt, including current portion, Fair Value	1,331.3	1,348.8
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	82.5	74.0
Restricted Cash, Carrying Amount	1.9	1.8
Receivables less provision for allowances, claims and doubtful accounts, Carrying Amount	466.4	385.4
Accounts payable, Carrying Amount	319.3	207.2
Long-term debt, including current portion, Carrying Amount	$ 1,254.8	$ 1,294.8