Employee Benefit Plans - Composition of Pension Plan Assets (Detail) (Defined Benefit Pension Plans, USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 479.1	$ 496.6
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan assets	22.1	22.0
Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	171.4	180.1
Level 1 | Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan assets	14.3	13.6
Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	53.6	55.0
Level 3 Inputs
Defined Benefit Plan Disclosure [Line Items]
Plan assets	254.1	261.5	238.1
Level 3 Inputs | Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan assets	7.8	8.4
Germany
Defined Benefit Plan Disclosure [Line Items]
Plan assets	240.7	247.5
Germany | Level 3 Inputs
Defined Benefit Plan Disclosure [Line Items]
Plan assets	240.7	247.5
Canada | Local Currency Equities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	12.4	24.0
Canada | Foreign Equities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	34.4	33.0
Canada | Local Currency Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	50.3	44.7
Canada | Global Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	10.1	6.1
Canada | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.6	0.5
Canada | Level 1 | Local Currency Equities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	12.4	24.0
Canada | Level 1 | Foreign Equities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	34.4	33.0
Canada | Level 1 | Local Currency Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	50.3	44.7
Canada | Level 1 | Global Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	10.1	6.1
Canada | Level 1 | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.6	0.5
Norway | Local Currency Equities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.9	2.0
Norway | Foreign Equities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	5.1	5.2
Norway | Local Currency Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	29.3	35.0
Norway | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	10.3	13.2
Norway | Foreign Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3.8	3.6
Norway | Real estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.5	4.8
Norway | Level 1 | Local Currency Equities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.9	2.0
Norway | Level 1 | Foreign Equities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	5.1	5.2
Norway | Level 1 | Local Currency Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	29.3	35.0
Norway | Level 1 | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9.2	12.4
Norway | Level 1 | Foreign Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3.8	3.6
Norway | Level 3 Inputs | Cash and Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.1	0.8
Norway | Level 3 Inputs | Real estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.5	4.8
United States | CMRT
Defined Benefit Plan Disclosure [Line Items]
Plan assets	53.6	55.0
United States | Level 2 | CMRT
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 53.6	$ 55.0