Retirement Plans and Post Retirement Benefits Funded Status, Assumptions Used in Benefit Obligations and Amounts Recognized in Balance Sheets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Benefit Obligation [Roll Forward]
Beginning of year balance	$ 297.0	$ 346.0
Service cost	3.0	3.0	$ 5.0
Interest cost	12.0	11.0	13.0
Actuarial (gain)/loss	24.0	(25.0)
Curtailment		1.0
Foreign exchange rate changes	2.0	(5.0)
Benefits Paid	26.0	32.0
End of year balance	312.0	297.0	346.0
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	275.0	266.0
Actual return on plan assets	39.0	(7.0)
Employer contribution	4.0	53.0
Foreign exchange rate changes	3.0	(5.0)
Fair value of plan assets, end of year balance	294.0	275.0	266.0
Funded status	(18.0)	(22.0)
Amounts Recognized in Balance Sheet [Abstract]
Noncurrent pension assets, included in “Other assets”	5.0	5.0
Current pension liabilities, included in “Accounts payable and accrued liabilities”	0.0	(3.0)
Noncurrent pension liabilities, included in “Other long-term liabilities”	(23.0)	(23.0)
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Net actuarial loss	(5.0)
Prior service cost	1.0
Benefits Expected to be Paid from Benefit Plans [Abstract]
2019	20.0
2020	21.0
2021	20.0
2022	20.0
2023	20.0
2024 - 2028	94.0
Defined Benefit Plan, Plan Assets, Benefits Paid	26.0	32.0
Multi-strategy Funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	53.0
Fair value of plan assets, end of year balance	53.0	53.0
Domestic stock funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	30.0
Fair value of plan assets, end of year balance	54.0	30.0
International stock funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	27.0
Fair value of plan assets, end of year balance	40.0	27.0
Domestic bond funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	116.0
Fair value of plan assets, end of year balance	93.0	116.0
Significant Unobservable Inputs (Level 3)
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Significant Unobservable Inputs (Level 3) | Domestic stock funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Significant Unobservable Inputs (Level 3) | International stock funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Significant Unobservable Inputs (Level 3) | Domestic bond funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Fair Value, Inputs, Level 1 [Member]
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	97.0
Fair value of plan assets, end of year balance	156.0	97.0
Fair Value, Inputs, Level 1 [Member] | Multi-strategy Funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	35.0
Fair value of plan assets, end of year balance	47.0	35.0
Fair Value, Inputs, Level 1 [Member] | Domestic stock funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	22.0
Fair value of plan assets, end of year balance	54.0	22.0
Fair Value, Inputs, Level 1 [Member] | International stock funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	13.0
Fair value of plan assets, end of year balance	40.0	13.0
Fair Value, Inputs, Level 1 [Member] | Domestic bond funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	27.0
Fair value of plan assets, end of year balance	15.0	27.0
Fair Value, Inputs, Level 2
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	29.0
Fair value of plan assets, end of year balance	22.0	29.0
Fair Value, Inputs, Level 2 | Multi-strategy Funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Fair Value, Inputs, Level 2 | Domestic stock funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Fair Value, Inputs, Level 2 | International stock funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Fair Value, Inputs, Level 2 | Domestic bond funds
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Amounts recognized in other comprehensive income—pre-tax
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.0	0.0
Reclassification from accumulated other comprehensive income, current period, before tax	(1.0)	1.0
Total	(8.0)	(7.0)	(8.0)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Amounts recognized in other comprehensive income—pre-tax
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.0	4.0
Reclassification from accumulated other comprehensive income, current period, before tax	4.0	8.0
Total	(119.0)	(123.0)	(136.0)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Amounts recognized in other comprehensive income—pre-tax
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.0	4.0
Reclassification from accumulated other comprehensive income, current period, before tax	5.0	8.0
Total	(111.0)	(116.0)	$ (128.0)
Defined Benefit, US Plans [Member]
Change in Benefit Obligation [Roll Forward]
Beginning of year balance	245.0
End of year balance	258.0	245.0
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	222.0
Fair value of plan assets, end of year balance	236.0	222.0
Funded status	$ (22.0)	$ (22.0)
Weighted average assumptions for obligations as of measurement date [Abstract]
Discount rate	3.10%	4.20%
Defined Benefit, Canadian Plans [Member]
Change in Benefit Obligation [Roll Forward]
Beginning of year balance	$ 49.0
End of year balance	54.0	$ 49.0
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	52.0
Fair value of plan assets, end of year balance	58.0	52.0
Funded status	$ 4.0	$ 3.0
Weighted average assumptions for obligations as of measurement date [Abstract]
Discount rate	3.00%	3.80%
Rate of compensation increase	3.50%	3.50%
Defined Benefit, SERP [Member]
Change in Benefit Obligation [Roll Forward]
Beginning of year balance	$ 3.0
End of year balance	0.0	$ 3.0
Change in Assets (Fair Value) [Roll Forward]
Fair value of plan assets, beginning of year balance	0.0
Fair value of plan assets, end of year balance	0.0	0.0
Funded status	$ 0.0	$ (3.0)
Weighted average assumptions for obligations as of measurement date [Abstract]
Discount rate		2.90%
Rate of compensation increase		3.00%