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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