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Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	$ 60.4	$ 113.5
Pension Benefits [Member] \| Other Long-Term Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	102.0	148.9
Pension Benefits [Member] \| Current Liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(2.0)	(2.3)
Pension Benefits [Member] \| Other Long-Term Liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(39.6)	(33.1)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(59.8)	(54.8)
Other Benefits [Member] \| Current Liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(3.7)	(4.0)
Other Benefits [Member] \| Other Long-Term Liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	$ (56.1)	$ (50.8)