Employee Benefit Plans - Composition of Pension Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 427.4	$ 430.1
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan assets	22.0	21.7
Level 1 | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	151.3	146.3
Level 1 | Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan assets	13.8	14.0
Level 2 | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	45.6	47.6
Level 3 Inputs | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	230.5	236.2	$ 254.1
Level 3 Inputs | Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Plan assets	8.2	7.7
Germany | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	217.0	223.1
Germany | Level 3 Inputs | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	217.0	223.1
Canada | Local Currency Equities | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	14.8	9.6
Canada | Foreign Equities | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	19.7	23.3
Canada | Local Currency Fixed Income | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	59.5	50.6
Canada | Global Mutual Fund | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets		6.8
Canada | Cash and Other | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.4	0.5
Canada | Level 1 | Local Currency Equities | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	14.8	9.6
Canada | Level 1 | Foreign Equities | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	19.7	23.3
Canada | Level 1 | Local Currency Fixed Income | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	59.5	50.6
Canada | Level 1 | Global Mutual Fund | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets		6.8
Canada | Level 1 | Cash and Other | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.4	0.5
Norway | Local Currency Equities | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.6	2.0
Norway | Foreign Equities | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.1	3.6
Norway | Local Currency Fixed Income | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	23.2	24.5
Norway | Cash and Other | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9.9	7.9
Norway | Foreign Fixed Income | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	5.4	4.7
Norway | Real Estate | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.2	4.2
Norway | Level 1 | Local Currency Equities | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.6	2.0
Norway | Level 1 | Foreign Equities | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.1	3.6
Norway | Level 1 | Local Currency Fixed Income | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	23.2	24.5
Norway | Level 1 | Cash and Other | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	8.8	6.7
Norway | Level 1 | Foreign Fixed Income | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	5.4	4.7
Norway | Level 3 Inputs | Cash and Other | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.1	1.2
Norway | Level 3 Inputs | Real Estate | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.2	4.2
United States | CMRT | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	45.6	47.6
United States | Level 2 | CMRT | Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 45.6	$ 47.6