Goodwill And Other Intangible Assets - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) component	Dec. 31, 2020 USD ($) reportingUnit	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Income approach, weighted percentage	75.00%	75.00%
Market-based approach, weighted percentage	25.00%	25.00%
Increase (decrease) in reporting units (in components) | component	3
Reporting units for goodwill impairment testing (in reporting units) | reportingUnit		6
Impairment loss		$ 0	$ 0	$ 0
Total intangible amortization expense		90,200,000	$ 89,500,000	$ 90,600,000
Future amortization expense, year one	$ 81,500,000	81,500,000
Future amortization expense, year two	80,900,000	80,900,000
Future amortization expense, year three	76,000,000.0	76,000,000.0
Future amortization expense, year four	68,800,000	68,800,000
Future amortization expense, year five	$ 68,600,000	$ 68,600,000