Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 01, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 29, 2021	Oct. 30, 2018
Distribution Made to Limited Partner [Line Items]
Stock repurchased during period (in shares)		471,364	235,590	864,233
Repurchase aggregate cost		$ 297.5	$ 27.9	$ 93.0
2021 Stock Repurchase Program
Distribution Made to Limited Partner [Line Items]
Authorized stock repurchase amount					$ 500.0
Remaining unused authorization for stock repurchase program			$ 445.6
Stock repurchased during period (in shares)		226,232		0
Repurchase aggregate cost		$ 54.4		$ 0.0
October 2018 Stock Repurchase Program
Distribution Made to Limited Partner [Line Items]
Authorized stock repurchase amount						$ 300.0
Remaining unused authorization for stock repurchase program					$ 97.9
Stock repurchased during period (in shares)		245,132	235,590	864,233
Repurchase aggregate cost		$ 49.2	$ 27.9	$ 93.0
Total Repurchase Programs
Distribution Made to Limited Partner [Line Items]
Repurchase aggregate cost		$ 103.6	$ 27.9	$ 93.0
Stock Repurchase Agreement with The Duchossois Group, Inc Affiliate
Distribution Made to Limited Partner [Line Items]
Stock repurchased during period (in shares)	1,000,000
Repurchase price (in dollars per share)	$ 193.94
Repurchase aggregate cost	$ 193.9