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Fair Value Measurements - Goodwill and Asset Impairment (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in unconsolidated ventures (Note 6)									$ 25,800,000	$ 36,800,000
Assets held for sale (Note 4)									0	15,800,000	$ 33,600,000
Goodwill and asset impairment	$ 18,966,000	$ 368,551,000	$ 1,559,000	$ 20,706,000	$ 221,877,000	$ 19,111,000	$ 4,152,000	$ 3,375,000	409,782,000	248,515,000	57,941,000
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill (Note 8)									205,000,000	0	0
Property, plant and equipment and leasehold intangibles, net (Note 7)									164,400,000	166,200,000	23,400,000
Investment in unconsolidated ventures (Note 6)									25,800,000	36,800,000	0
Other intangible assets, net (Note 8)									14,600,000	29,700,000	900,000
Assets held for sale (Note 4)									0	15,800,000	33,600,000
Goodwill and asset impairment									$ 409,800,000	$ 248,500,000	$ 57,900,000

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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