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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
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Beginning of year balance |  | $ 345.5 |  | $ 331.9 |  |
Service cost |  | 2.6 |  | 4.9 |  | $ 4.3
Interest cost |  | 11.1 |  | 12.5 |  | 13.1
Actuarial (gain)/loss |  | (24.5) |  | 10.8 |  |
Curtailment |  | (1.3) |  | 0.0 |  |
Foreign exchange rate changes |  | (4.5) |  | 3.6 |  |
Benefits Paid |  | 32.2 |  | 18.2 |  |
End of year balance |  | 296.7 |  | 345.5 |  | 331.9
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance |  | 265.9 |  | 239.9 |  |
Actual return on plan assets |  | (7.3) |  | 27.8 |  |
Employer contribution |  | 52.9 |  | 12.7 |  |
Foreign exchange rate changes |  | (4.5) |  | 3.7 |  |
Fair value of plan assets, end of year balance |  | 274.8 |  | 265.9 |  | 239.9
Funded status |  | (21.9) |  | (79.6) |  |
Amounts Recognized in Balance Sheet [Abstract] |  |  |  |  |  |
Noncurrent pension assets, included in “Other assets” |  | 4.5 |  | 1.4 |  |
Current pension liabilities, included in “Accounts payable and accrued liabilities” |  | (3.1) |  | (12.1) |  |
Noncurrent pension liabilities, included in “Other long-term liabilities” |  | (23.3) |  | (68.9) |  |
Amounts recognized in other comprehensive income—pre-tax |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | (12.4) |  | 10.2 |  | 2.9
Reclassification from accumulated other comprehensive income, current period, before tax |  | 8.1 |  | 9.7 |  | 6.0
Defined Benefit Plan, Accumulated Benefit Obligation |  | 296.5 |  | 343.2 |  |
Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract] |  |  |  |  |  |
Accumulated benefit obligations |  | 248.8 |  | 287.9 |  |
Fair value of plan assets |  | 222.4 |  | 207.7 |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 248.8 |  | 288.7 |  |
Plans with Projected Benefit Obligations in Excess of Plan Assets [Abstract] |  |  |  |  |  |
Fair value of plan assets |  | 222.4 |  | 207.7 |  |
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract] |  |  |  |  |  |
Net actuarial loss |  | (4.7) |  |  |  |
Prior service cost |  | 0.5 |  |  |  |
Total |  | 5.2 |  |  |  |
Benefits Expected to be Paid from Benefit Plans [Abstract] |  |  |  |  |  |
2019 |  | 22.4 |  |  |  |
2020 |  | 20.3 |  |  |  |
2021 |  | 20.4 |  |  |  |
2022 |  | 19.6 |  |  |  |
2023 |  | 20.1 |  |  |  |
2024 - 2028 |  | 96.6 |  |  |  |
Defined Benefit Plan, Plan Assets, Benefits Paid |  | 32.2 |  | 18.2 |  |
Multi-strategy Funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [1] | 82.5 |  |  |  |
Fair value of plan assets, end of year balance |  | 35.0 |  | 82.5 | [1] |
Domestic stock funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [2] | 56.2 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 22.3 |  | 56.2 |  |
International stock funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [2] | 43.1 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 13.2 |  | 43.1 |  |
Domestic bond funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [2] | 40.2 |  |  |  |
Fair value of plan assets, end of year balance |  | 27.1 | [3] | 40.2 | [2] |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance |  | 12.9 |  |  |  |
Fair value of plan assets, end of year balance |  | 12.7 |  | 12.9 |  |
Significant Unobservable Inputs (Level 3) | Multi-strategy Funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [1] | 12.9 |  |  |  |
Fair value of plan assets, end of year balance |  | 0.0 |  | 12.9 | [1] |
Significant Unobservable Inputs (Level 3) | Domestic stock funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [2] | 0.0 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 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 | [2] | 0.0 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 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 | [2] | 0.0 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 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 |  | 147.5 |  |  |  |
Fair value of plan assets, end of year balance |  | 101.5 |  | 147.5 |  |
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 | [1] | 69.6 |  |  |  |
Fair value of plan assets, end of year balance |  | 35.0 |  | 69.6 | [1] |
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 | [2] | 42.2 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 22.3 |  | 42.2 |  |
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 | [2] | 15.5 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 13.2 |  | 15.5 |  |
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 | [2] | 20.2 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 27.1 |  | 20.2 |  |
Fair Value, Inputs, Level 2 |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance |  | 105.5 |  |  |  |
Fair value of plan assets, end of year balance |  | 160.6 |  | 105.5 |  |
Fair Value, Inputs, Level 2 | Multi-strategy Funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [1] | 0.0 |  |  |  |
Fair value of plan assets, end of year balance |  | 0.0 |  | 0.0 | [1] |
Fair Value, Inputs, Level 2 | Domestic stock funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [2] | 14.0 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 0.0 |  | 14.0 |  |
Fair Value, Inputs, Level 2 | International stock funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [2] | 27.6 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 0.0 |  | 27.6 |  |
Fair Value, Inputs, Level 2 | Domestic bond funds |  |  |  |  |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance | [2] | 20.0 |  |  |  |
Fair value of plan assets, end of year balance | [2] | 0.0 |  | 20.0 |  |
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 |  | 0.0
Reclassification from accumulated other comprehensive income, current period, before tax |  | 0.5 |  | 0.5 |  | 0.5
Total |  | (7.4) |  | (7.9) |  | (8.4)
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 |  | 4.1 |  | 3.2 |  |
Reclassification from accumulated other comprehensive income, current period, before tax |  | 8.1 |  | 9.8 |  |
Total |  | (123.8) |  | (136.0) |  | (149.0)
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 |  | 4.1 |  | 3.2 |  | (5.3)
Reclassification from accumulated other comprehensive income, current period, before tax |  | 7.6 |  | 9.3 |  | 5.5
Total |  | (116.4) |  | (128.1) |  | $ (140.6)
Defined Benefit, US Plans [Member] |  |  |  |  |  |
Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Beginning of year balance |  | 272.6 |  |  |  |
End of year balance |  | 244.8 |  | 272.6 |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance |  | 207.7 |  |  |  |
Employer contribution |  | 33.2 |  |  |  |
Fair value of plan assets, end of year balance |  | 222.4 |  | 207.7 |  |
Funded status |  | $ (22.4) |  | $ (64.9) |  |
Weighted average assumptions for obligations as of measurement date [Abstract] |  |  |  |  |  |
Discount rate |  | 4.20% |  | 3.50% |  |
Defined Benefit, Canadian Plans [Member] |  |  |  |  |  |
Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Beginning of year balance |  | $ 58.1 |  |  |  |
End of year balance |  | 49.0 |  | $ 58.1 |  |
Change in Assets (Fair Value) [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning of year balance |  | 58.2 |  |  |  |
Fair value of plan assets, end of year balance |  | 52.4 |  | 58.2 |  |
Funded status |  | $ 3.4 |  | $ 0.1 |  |
Weighted average assumptions for obligations as of measurement date [Abstract] |  |  |  |  |  |
Discount rate |  | 3.80% |  | 3.30% |  |
Rate of compensation increase |  | 3.50% |  | 3.50% |  |
Defined Benefit, SERP [Member] |  |  |  |  |  |
Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Beginning of year balance |  | $ 14.8 |  |  |  |
End of year balance |  | 2.9 |  | $ 14.8 |  |
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 |  | $ (2.9) |  | $ (14.8) |  |
Weighted average assumptions for obligations as of measurement date [Abstract] |  |  |  |  |  |
Discount rate |  |  |  | 2.90% |  |
Rate of compensation increase |  |  |  | 3.00% |  |
[1] | The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.
[2] | Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[3] | Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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