Employee Benefit Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions		12 Months Ended
	Jul. 01, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Nov. 12, 2019	Aug. 28, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock options - term for stock options granted, in years		10 years
Vesting term options granted		4 years
Cash payments for Restricted Stock Units		$ 34.6		$ 26.6		$ 27.1
Aggregate intrinsic value of stock options outstanding and exercisable		102.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value		$ 66.8
Weighted average remaining life of stock options outstanding and exercisable		7 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		6 years
Aggregate intrinsic value for options exercised		$ 78.0		78.2		60.0
Award requisite service period		3 years
Supplemental Officers Retirement Plan Freeze Date	Jul. 01, 2019
Defined Benefit Plan, Accumulated Benefit Obligation		$ 2,167.5		1,938.0
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax		(429.6)
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax		(2.5)
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year		9.0
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year		0.2
Defined Benefit Plan, Plan Assets, Contributions by Employer		9.8		10.0
Expected future plan benefit payment - 2019		99.5
Expected future plan benefit payment - 2020		117.8
Expected future plan benefit payment - 2021		99.3
Expected future plan benefit payment - 2022		106.3
Expected future plan benefit payment - 2023		119.4
Expected future plan benefit payment - 2024 to 2028		639.4
Fair Value of Plan Assets		1,988.8		$ 1,910.5		$ 2,178.1
Additional estimated future contribution		$ 9.3
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			$ 112.7		$ 110.9		$ 100.6
Stock Repurchase Program, Authorized Amount								$ 5,000.0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased									25
Time Based Restriced Stock granted during or after Fiscal 2019 [Domain]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting term options granted		3 years
Time Based Restricted Stock granted during Fiscal 2013 [Domain] [Domain]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting term options granted		2 years
Performance Based Restricted Stock and Units [Domain]
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 [Member]
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 [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost		$ 18.2
Weighted-average remaining requisite vesting period		2 years 3 months 18 days
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost		$ 30.8
Weighted-average remaining requisite vesting period		1 year 6 months
Non-Vested Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total remaining unrecognized compensation cost		$ 102.1
Weighted-average remaining requisite vesting period		1 year 10 months 24 days
Minimum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Performance Period		1 year
Maximum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Performance Period		3 years
Maximum [Member] | Performance Based Restricted Stock and Units [Domain]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting term options granted		38 months