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Commitments (Tables) | 12 Months Ended
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Dec. 31, 2021
Lessee, Lease, Description [Line Items] |
Lease, Cost [Table Text Block] | The components of lease costs were as follows for the years ended December 31, 2021 and 2020:
(in millions) | 2021 |  | 2020
Operating lease expense: |  |  |
Operating lease cost | $ | 63.2 |  |  | $ | 66.1 |
Short-term lease cost | 0.7 |  |  | 0.7 |
Total operating lease expense included in other expense | $ | 63.9 |  |  | $ | 66.8 |
Finance lease expense: |  |  |
Interest expense | $ | 3.1 |  |  | $ | 3.3 |
Depreciation expense | 8.7 |  |  | 8.7 |
Total finance lease expense | $ | 11.8 |  |  | $ | 12.0 |
Sublease revenue included in other revenue | $ | 10.4 |  |  | $ | 13.3 |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | Supplemental cash flow information related to leases was as follows for years ended December 31, 2021 and 2020:
(in millions) | 2021 |  | 2020
Cash outflows for operating leases | $ | 64.2 |  |  | $ | 64.3 |
Cash outflows for finance leases | 17.0 |  | 16.9 |
Lessee, Operating Lease, Liability, Maturity | Future minimum lease payments were as follows as of December 31, 2021 for operating and finance leases:
(in millions) |  | Operating Leases
2022 |  | 66.2 |
2023 |  | 66.4 |
2024 |  | 61.6 |
2025 |  | 58.7 |
2026 |  | 54.3 |
Thereafter |  | 306.4 |
Total lease payments |  | 613.6 |
Less: imputed interest |  | (116.9) |
Present value of lease liability |  | $ | 496.7 |
Finance Lease, Liability, Fiscal Year Maturity |
(in millions) |  | Finance Lease
2022 |  | 17.1 |
2023 |  | 17.2 |
2024 |  | 17.4 |
2025 |  | 17.5 |
2026 |  | 17.6 |
Thereafter |  | 76.7 |
Total lease payments |  | 163.5 |
Less: imputed interest |  | (79.7) |
Present value of lease liability |  | $ | 83.8 |
Property Subject to Operating Lease [Member] |
Lessee, Lease, Description [Line Items] |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | Supplemental balance sheet information related to leases was as follows as of December 31, 2021 and 2020: Operating leases
(in millions) | 2021 |  | 2020
Operating lease right-of-use assets | $ | 345.3 |  |  | $ | 390.3 |
Operating lease liabilities: |  |  |
Other current liabilities | $ | 47.3 |  |  | $ | 44.5 |
Other liabilities | 449.4 |  |  | 492.2 |
Total operating lease liabilities | $ | 496.7 |  |  | $ | 536.7 |
Weighted average remaining lease term (in months) | 132 |  | 138
Weighted average discount rate | 3.9 | % |  | 3.9 | %
Property Subject to Finance Lease [Member] |
Lessee, Lease, Description [Line Items] |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | Finance leases
(in millions) | 2021 |  | 2020
Finance lease right-of-use assets | $ | 80.2 |  |  | $ | 88.8 |
Finance lease liabilities: |  |  |
Other current liabilities | $ | 7.9 |  |  | $ | 7.7 |
Other liabilities | 75.9 |  |  | 83.8 |
Total finance lease liabilities | $ | 83.8 |  |  | $ | 91.5 |
Weighted average remaining lease term (in months) | 111 |  | 123
Weighted average discount rate | 3.5 | % |  | 3.5 | %

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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