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Retirement Plans and Other Post-Retirement Benefits - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ 61.5	$ (84.7)
Plan amendments	3.6
Amortization of prior service cost	(3.3)	(3.1)	(2.5)
Amortization of actuarial losses	(12.1)	(21.1)	(17.0)
Total recognized in other comprehensive (income) loss	49.7	(108.9)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	56.4	(94.7)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	4.5	(10.5)
Amortization of prior service cost	0.3	0.5	0.9
Amortization of actuarial losses	(0.4)	(0.6)	(0.7)
Total recognized in other comprehensive (income) loss	4.4	(10.6)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	$ 8.5	$ (5.5)

Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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