Subsequent Event (Details) T in Thousands, shares in Millions, $ in Millions			12 Months Ended			24 Months Ended
	Jan. 29, 2020 USD ($) shares	Jan. 28, 2020 USD ($) T	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 shares
Subsequent Event [Line Items]
Shares repurchased (in shares) | shares						20.8
Repurchase of common stock (in shares)					$ 58.4
Payments to acquire business			$ 54.5	$ 89.4	$ 189.4
Subsequent Event
Subsequent Event [Line Items]
Shares repurchased (in shares) | shares	15.1
Repurchase of common stock (in shares)	$ 250.0
Subsequent Event | Quad/Graphics, Inc. [Member]
Subsequent Event [Line Items]
Payments to acquire business		$ 40.0
Paperboard Facility Capacity | T		40