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Employee Benefit Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2019 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Vesting term options granted |  | 4 years |  |  |  |  |  |
Stock options - term for stock options granted, in years |  | 10 years |  |  |  |  |  |
Treasury stock, shares repurchased |  | 8.2 |  | 6.2 |  | 6.5 |  |
Cash payments for Restricted Stock Units |  | $ 10.7 |  | $ 34.6 |  | $ 26.6 |  |
Aggregate intrinsic value of stock options outstanding and exercisable |  | 237.0 |  |  |  |  |  |
Options, vested and expected to vest, exercisable, aggregate intrinsic value |  | $ 116.9 |  |  |  |  |  |
Weighted average remaining life of stock options outstanding and exercisable |  | 7 years |  |  |  |  |  |
Options, exercisable, weighted average remaining contractual term |  | 6 years |  |  |  |  |  |
Aggregate intrinsic value for options exercised |  | $ 58.6 |  | 78.0 |  | 78.2 |  |
Supplemental officers retirement plan freeze date | Jul. 01, 2019 |  |  |  |  |  |  |
Defined benefit plan, accumulated benefit obligation |  | 2,135.0 |  | 2,167.5 |  |  |  |
Prior service credits recognized |  |  |  | 17.0 |  |  |  |
Minimum age required for plan eligibility |  |  |  |  |  |  |  | 55 years
Minimum amount of service required for plan eligibility |  |  |  |  |  |  |  | 10 years
Defined benefit plan, benefit obligation, payment for settlement |  |  |  |  |  | 48.2 |  |
Accumulated other comprehensive income net gains (losses), after tax |  | (145.8) |  |  |  |  |  |
Accumulated other comprehensive income net prior service cost (credit), after tax |  | (2.5) |  |  |  |  |  |
Amount to be amortized from accumulated other comprehensive income (loss) next fiscal year |  | 6.6 |  |  |  |  |  |
Expected amortization of prior service cost (credit), next fiscal year |  | 0.3 |  |  |  |  |  |
Plan assets |  | 2,306.3 |  | 1,988.8 |  | $ 1,910.5 |  |
Employer contributions |  | 10.9 |  | 9.8 |  |  |  |
Additional estimated future contribution |  | 10.0 |  |  |  |  |  |
Expected future plan benefit payment - 2022 |  | 120.4 |  |  |  |  |  |
Expected future plan benefit payment - 2023 |  | 112.9 |  |  |  |  |  |
Expected future plan benefit payment - 2024 |  | 120.0 |  |  |  |  |  |
Expected future plan benefit payment - 2025 |  | 111.0 |  |  |  |  |  |
Expected future plan benefit payment - 2026 |  | 115.7 |  |  |  |  |  |
Expected future plan benefit payment - 2027 to 2031 |  | $ 643.7 |  |  |  |  |  |
Defined contribution plan, maximum annual contribution per employee, percent |  | 50.00% |  |  |  |  |  |
Highly compensated employee contribution percentage to retirement and saving plan |  | 12.00% |  |  |  |  |  |
Defined contribution plan, cost |  |  | $ 130.8 |  | $ 112.7 |  | $ 110.9 |
Time Based Restriced Stock granted during or after September 1, 2018 |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Vesting term options granted |  | 3 years |  |  |  |  |  |
Performance Based Restricted Stock and Units |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Minimum percentage that will ultimately vest under performance-based restricted stock awards based on performance target |  | 0.00% |  |  |  |  |  |
Maximum percentage that will ultimately vest under performance-based restricted stock awards based on performance target |  | 150.00% |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Purchase price of common stock as percentage of market value |  | 95.00% |  |  |  |  |  |
Non-Vested Stock Options |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Total remaining unrecognized compensation cost |  | $ 19.2 |  |  |  |  |  |
Weighted-average remaining requisite vesting period |  | 2 years 2 months 12 days |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Total remaining unrecognized compensation cost |  | $ 43.5 |  |  |  |  |  |
Weighted-average remaining requisite vesting period |  | 1 year 7 months 6 days |  |  |  |  |  |
Non-Vested Restricted Stock |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Total remaining unrecognized compensation cost |  | $ 113.1 |  |  |  |  |  |
Weighted-average remaining requisite vesting period |  | 1 year 9 months 18 days |  |  |  |  |  |
Cash and cash equivalents | Level 1 |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Plan assets |  | $ 8.2 |  | $ 20.1 |  |  |  |
Minimum | Performance Based Restricted Stock and Units |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Performance period (years) |  | 1 year |  |  |  |  |  |
Maximum | Performance Based Restricted Stock and Units |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |  |
Vesting term options granted |  | 38 months |  |  |  |  |  |
Performance period (years) |  | 3 years |  |  |  |  |  |

X
- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year, excluding the next fiscal year contributions to date. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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