Financing Arrangements and Debt - Narrative (Details) - USD ($)	2 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	[1]	Nov. 30, 2019	Oct. 31, 2019	May 31, 2019
Line of Credit Facility [Line Items]
Amount outstanding	$ 0	$ 200,000,000	$ 0
Cost of debt extinguishment			32,100,000
Debt extinguishment cost		0	$ 26,626,000	$ 0
Future maturities of long term debt in 2021		0
Future maturities of long term debt in 2022		576,400,000
Future maturities of long term debt in 2023		200,000,000.0
Future maturities of long term debt in 2024		542,400,000
Future maturities of long term debt in 2025		548,700,000
Future maturities of long term debt, thereafter		$ 1,140,000,000
5.875% notes, due December 2027
Line of Credit Facility [Line Items]
Face amount of notes						$ 550,000,000
Interest rate		5.875%				5.875%
Transaction costs						$ 7,400,000
4.00% notes, due June 2022
Line of Credit Facility [Line Items]
Interest rate	4.00%	4.00%	4.00%
Repayments of debt	$ 239,700,000
4.45% notes, due 2022
Line of Credit Facility [Line Items]
Interest rate	4.45%		4.45%
Repayments of debt	$ 281,600,000
3.70% notes, due 2022
Line of Credit Facility [Line Items]
Interest rate							3.70%
2018 Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 1,600,000,000
Amount outstanding		$ 200,000,000.0
Interest rate on credit facility		1.84%
2018 Revolving Credit Facility | Letter of Credit
Line of Credit Facility [Line Items]
Amount outstanding		$ 3,800,000
New Term Credit Facility
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity								$ 500,000,000

[1] Reclassified to conform with current presentation