Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill impairment	$ 0	$ 0
Goodwill	103,000,000.0	103,000,000.0	$ 44,500,000
Impairment of intangible assets	0	0
Amortization expense for other intangible assets	39,100,000	44,800,000
United States Book Business \| Discontinued Operations, Held-for-sale
Goodwill [Line Items]
Goodwill impairment	$ 42,000,000.0	$ 10,100,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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