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Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 491.7	$ 457.6	$ 415.8	$ 389.4	$ 405.2	$ 403.6	$ 380.4	$ 365.6	$ 1,754.5	$ 1,554.8	$ 1,678.2
Income (loss) before income taxes	21.1	18.6	(49.8)	(54.3)	(7.4)	6.7	(2.7)	(1.5)	(64.4)	(4.9)	156.9
Net income (loss)	$ 214.3	$ 12.8	$ (27.6)	$ (39.2)	$ (13.2)	$ 3.0	$ (8.0)	$ (1.5)	$ 160.3	$ (19.7)	$ 111.3
Income (loss) per share:
Basic (in USD per share)	$ 7.57	$ 0.45	$ (0.98)	$ (1.39)	$ (0.47)	$ 0.11	$ (0.28)	$ (0.05)	$ 5.66	$ (0.70)	$ 3.69
Diluted (in USD per share)	$ 7.44	$ 0.45	$ (0.98)	$ (1.39)	$ (0.47)	$ 0.11	$ (0.28)	$ (0.05)	$ 5.60	$ (0.70)	$ 3.69

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