Derivatives and Fair Value Measurements - Carrying and Estimated Fair Values Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	$ 68.6	$ 74.0	$ 80.7	$ 70.8
Restricted Cash, Carrying Amount	1.9	1.8
Receivables less provision for allowances, claims and doubtful accounts, Carrying Amount	468.2	385.4
Accounts payable, Carrying Amount	286.0	207.2
Long-term debt, including current portion, Carrying Amount	1,227.8	1,294.8
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Fair Value	68.6	74.0
Restricted Cash, Fair Value	1.9	1.8
Receivables less provision for allowances, claims and doubtful accounts, Fair Value	468.2	385.4
Accounts payable, Fair Value	286.0	207.2
Long-term debt, including current portion, Fair Value	1,279.8	1,348.8
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Carrying Amount	68.6	74.0
Restricted Cash, Carrying Amount	1.9	1.8
Receivables less provision for allowances, claims and doubtful accounts, Carrying Amount	468.2	385.4
Accounts payable, Carrying Amount	286.0	207.2
Long-term debt, including current portion, Carrying Amount	$ 1,227.8	$ 1,294.8