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Income Tax (Tables)
 12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Pretax income for computation of income tax provision
Our income (loss) before income taxes on which the provision for income taxes was computed is as follows:
 For the years ended
 December 31, 2020December 31, 2019December 31, 2018
 (In millions)
Domestic$1,151.7 $1,136.1 $1,320.4 
Foreign(1,795.6)(656.2)39.4 
Total$(643.9)$479.9 $1,359.8 
Current and deferred provisions of income tax expense (benefits)
 For the years ended
 December 31, 2020December 31, 2019December 31, 2018
 (In millions)
Current:   
Federal$79.0 $69.1 $(22.9)
State5.2 9.4 (4.7)
Foreign111.4 46.7 38.7 
Total current tax (benefit) expense$195.6 $125.2 $11.1 
Deferred:   
Federal$101.9 $128.3 $232.2 
State19.5 22.2 31.2 
Foreign(15.2)(42.0)(49.3)
Total deferred tax (benefit) expense$106.2 $108.5 $214.1 
Total income tax (benefit) expense$301.8 $233.7 $225.2 
Computation of effective income tax rate
 For the years ended
 December 31, 2020December 31, 2019December 31, 2018
($ in millions)
Statutory federal income tax rate21.0 %$(135.2)21.0 %$100.8 21.0 %$285.5 
State income taxes, net of federal benefits(1.7)%11.0 3.4 %16.4 1.4 %18.8 
Effect of foreign tax rates and tax planning3.5 %(22.3)(21.2)%(101.8)(8.1)%(109.5)
Effect of foreign tax law and rate changes(0.9)%6.0 — %— — %— 
Effect of unrecognized tax benefits(26.1)%167.9 3.7 %18.0 0.8 %10.9 
Change in valuation allowance1.3 %(8.4)6.0 %28.8 0.7 %9.5 
Goodwill impairment(41.4)%266.8 36.5 %175.3 — %— 
Other, net(2.6)%16.0 (0.7)%(3.8)0.8 %10.0 
Effective tax rate / Tax (benefit) expense(46.9)%$301.8 48.7 %$233.7 16.6 %$225.2 
The decrease to the effective tax rate, when compared to the statutory rate, for fiscal year 2020 is primarily driven by two items. The impact of the $1,484.3 million goodwill impairment, recorded within our Europe segment in the fourth quarter of 2020, of which a majority related to nondeductible goodwill and the recognition of approximately $135 million of tax expense following the enactment of the U.S. final hybrid regulations, recorded in the second quarter of 2020. The increase in the effective tax rate, when compared to the statutory rate, for fiscal year 2019 was primarily driven by the $668.3 million goodwill impairment recorded within our North America segment in 2019, increased valuation allowances, and the recognition of other one-time tax expenses. The decrease in the effective tax rate, when compared to the statutory rate, for fiscal year 2018 was primarily driven by one-time tax benefits.
Additionally, our foreign businesses operate in jurisdictions with statutory income tax rates that differ from the U.S. Federal statutory rate. Specifically, the statutory income tax rates in the countries in Europe in which we operate range from 9% to 25%, and Canada has a statutory income tax rate of approximately 26%.
During the third quarter of 2020, the U.K. government enacted legislation to repeal the previously enacted reduction to the U.K. corporate income tax rate. Remeasurement of our deferred tax liabilities resulted in the recognition of additional tax expense of approximately $6 million in 2020.
Composition of deferred tax assets and liabilities
 As of
 December 31, 2020December 31, 2019
 (In millions)
Non-current deferred tax assets:  
Compensation-related obligations$60.9 $54.8 
Pension and postretirement benefits102.4 115.9 
Derivative instruments76.5 41.8 
Tax credit carryforwards56.2 41.1 
Tax loss carryforwards331.6 267.1 
Accrued liabilities and other75.5 50.1 
Valuation allowance(62.2)(73.8)
Total non-current deferred tax assets$640.9 $497.0 
Non-current deferred tax liabilities:  
Fixed assets358.3 353.7 
Partnerships and investments19.6 18.8 
Foreign exchange gain/loss— — 
Intangible assets2,396.9 2,279.9 
Total non-current deferred tax liabilities$2,774.8 $2,652.4 
Net non-current deferred tax assets— — 
Net non-current deferred tax liabilities$2,133.9 $2,155.4 
The overall decrease in net deferred tax liabilities of $21.5 million in 2020 is primarily due to an increase in deferred tax assets of $143.9 million attributable to additional tax loss carryforwards, tax credits, and future deductible temporary differences generated in 2020, offset by an increase in deferred tax liabilities of $122.4 million related to the amortization of goodwill and indefinite-lived intangible assets for U.S. tax purposes due to the Acquisition. Additionally, our deferred tax balances are also impacted by foreign exchange rates, as a significant amount of our deferred tax assets and liabilities are in foreign jurisdictions.
Our deferred tax valuation allowances are primarily the result of uncertainties regarding the future realization of recorded tax benefits on tax loss carryforwards from operations in various jurisdictions. The measurement of deferred tax assets is reduced by a valuation allowance if, based upon available evidence, it is more likely than not that the deferred tax assets will not be realized. We have evaluated the realizability of our deferred tax assets in each jurisdiction by assessing the adequacy of expected taxable income, including the reversal of existing temporary differences, historical and projected operating results and the availability of prudent and feasible tax planning strategies. Based on this analysis, we have determined that the valuation allowances recorded in each period presented are appropriate.
We have deferred tax assets for U.S. tax carryforwards that expire between 2021 and 2040 of $62.4 million as of December 31, 2020, and that expire between 2020 and 2039 of $63.2 million as of December 31, 2019. We have U.S. tax losses that may be carried forward indefinitely of $19.9 million and $0 million as of December 31, 2020 and December 31, 2019, respectively. We have foreign tax loss carryforwards that expire between 2021 and 2040 of $283.5 million as of December 31, 2020, and that expire between 2020 and 2039 of $233.8 million as of December 31, 2019. We have foreign tax losses that may be carried forward indefinitely of $22.0 million and $11.2 million as of December 31, 2020 and December 31, 2019, respectively.
 As of
 December 31, 2020December 31, 2019
 (In millions)
Domestic net non-current deferred tax liabilities$1,542.8 $1,488.5 
Foreign net non-current deferred tax assets105.7 34.8 
Foreign net non-current deferred tax liabilities696.8 701.7 
Net non-current deferred tax liabilities$2,133.9 $2,155.4 
The fiscal year 2020 and 2019 amounts above exclude $142.1 million and $68.4 million, respectively, of unrecognized tax benefits that have been recorded as a reduction of non-current deferred tax assets, which is presented within non-current deferred tax liabilities due to jurisdictional netting on the consolidated balance sheets.
Schedule of Unrecognized Tax Benefits Roll Forward
A reconciliation of the beginning and ending amounts of unrecognized tax benefits, excluding interest and penalties, is as follows:
 For the years ended
 December 31, 2020December 31, 2019December 31, 2018
 (In millions)
Balance at beginning of year$72.4 $51.6 $41.9 
Additions for tax positions related to the current year22.8 18.1 22.3 
Additions for tax positions of prior years132.1 — 0.7 
Reductions for tax positions of prior years(1.6)— (8.4)
Settlements(0.4)— — 
Release due to statute expirations— (0.8)(1.6)
Foreign currency adjustment10.4 3.5 (3.3)
Balance at end of year$235.7 $72.4 $51.6 
Our remaining unrecognized tax benefits as of December 31, 2020, relate to tax years that are currently open to examination. Annual tax provisions include amounts considered sufficient to pay assessments that may result from examination of prior year tax returns; however, the amount ultimately paid upon resolution of issues may differ materially from the amount accrued.     
Due to anticipated settlements and expected expiration of statutes of limitation, it is reasonably possible that the amount of unrecognized tax benefits may decrease by an amount up to $150 million within the next 12 months.
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]
 For the years ended
 December 31, 2020December 31, 2019December 31, 2018
(In millions)
Reconciliation of unrecognized tax benefits balance
Estimated interest and penalties$11.4 $2.9 $2.3 
Unrecognized tax positions235.7 72.4 51.6 
Total unrecognized tax benefits$247.1 $75.3 $53.9 
Presented net against non-current deferred tax assets$142.1 $68.4 $47.8 
Current (included in accounts payable and other current liabilities)98.0 — — 
Non-current (included within other liabilities)7.0 6.9 6.1 
Total unrecognized tax benefits$247.1 $75.3 $53.9 
Amount of unrecognized tax benefits that would impact the effective tax rate, if recognized(1)
$87.7 $72.4 $51.6 
(1)Amounts exclude the potential effects of valuation allowances, which may fully or partially offset the impact to the effective tax rate.