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Statements of Unaudited Condensed Consolidated Changes in Equity Statement - USD ($) $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period (in shares) at Dec. 31, 2017 |  | 297,400,000 |  |  |  |  |
Balance, beginning of period PY at Dec. 31, 2017 | $ (444.1) | $ 37.7 | $ 3,933.9 | $ (4,207.3) | $ (169.6) | $ (39.0) | $ 0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Adoption of accounting standard | 34.0 |  |  | 34.0 |  |  |
NET INCOME (LOSS) | (84.3) |  |  | (84.3) |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  |  |  |  |  | 7.7 |
Other Comprehensive Income (Loss), Net of Tax | 7.7 |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | (76.6) |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 300,000 |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 1.9 |  | (15.8) |  | 17.7 |  |
Balance, end of period (in shares) at Mar. 31, 2018 |  | 297,700,000 |  |  |  |  |
Balance, end of period PY at Mar. 31, 2018 | (484.8) | $ 37.7 | 3,918.1 | (4,257.6) | (151.9) | (31.3) | 0.2
Balance, beginning of period (in shares) at Dec. 31, 2017 |  | 297,400,000 |  |  |  |  |
Balance, beginning of period PY at Dec. 31, 2017 | (444.1) | $ 37.7 | 3,933.9 | (4,207.3) | (169.6) | (39.0) | 0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
NET INCOME (LOSS) | 518.6 |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (204.4) |  |  |  |  |  |
Balance, end of period (in shares) at Sep. 30, 2018 |  | 298,000,000.0 |  |  |  |  |
Balance, end of period PY at Sep. 30, 2018 | (86.2) | $ 37.7 | 3,913.3 | (3,654.7) | (139.1) | (243.4) | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
TOTAL COMPREHENSIVE LOSS | 314.2 |  |  |  |  |  |
Balance, beginning of period (in shares) at Mar. 31, 2018 |  | 297,700,000 |  |  |  |  |
Balance, beginning of period PY at Mar. 31, 2018 | (484.8) | $ 37.7 | 3,918.1 | (4,257.6) | (151.9) | (31.3) | 0.2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
NET INCOME (LOSS) | 165.1 |  |  | 165.1 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  |  |  |  |  | 9.1 |
Other Comprehensive Income (Loss), Net of Tax | 9.1 |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 174.2 |  |  |  |  |  |
Distributions to noncontrolling interest | (0.2) |  |  |  |  |  | (0.2)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 100,000 |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 4.5 |  | 0.2 |  | 4.3 |  |
Balance, end of period (in shares) at Jun. 30, 2018 |  | 297,800,000 |  |  |  |  |
Balance, end of period PY at Jun. 30, 2018 | (306.3) | $ 37.7 | 3,918.3 | (4,092.5) | (147.6) | (22.2) | 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
NET INCOME (LOSS) | 437.8 |  |  | 437.8 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  |  |  |  |  | (221.2) |
Other Comprehensive Income (Loss), Net of Tax | (221.2) |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 216.6 |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 200,000 |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 3.5 |  | (5.0) |  | 8.5 |  |
Balance, end of period (in shares) at Sep. 30, 2018 |  | 298,000,000.0 |  |  |  |  |
Balance, end of period PY at Sep. 30, 2018 | (86.2) | $ 37.7 | 3,913.3 | (3,654.7) | (139.1) | (243.4) | $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
TOTAL COMPREHENSIVE LOSS | 216.6 |  |  |  |  |  |
Balance, beginning of period at Dec. 31, 2018 | $ 424.2 | $ 37.7 | 3,916.7 | (3,060.2) | (186.1) | (283.9) |
Balance, beginning of period (in shares) at Dec. 31, 2018 | 292,611,569 | 292,600,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
NET INCOME (LOSS) | $ (22.1) |  |  | (22.1) |  |  |
Other Comprehensive Income (Loss), Net of Tax | 8.4 |  |  |  |  | 8.4 |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 1,700,000 |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | (10.0) |  | (56.5) |  | 46.5 |  |
Stock Repurchased During Period, Shares |  | (11,500,000) |  |  |  |  |
Common Share Repurchases, Value | (124.3) |  |  |  | (124.3) |  |
Dividends, Common Stock | (14.5) |  |  | (14.5) |  |  |
Balance, end of period at Mar. 31, 2019 | 261.7 | $ 37.7 | 3,860.2 | (3,096.8) | (263.9) | (275.5) |
Balance, end of period (in shares) at Mar. 31, 2019 |  | 282,800,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
TOTAL COMPREHENSIVE LOSS | (13.7) |  |  |  |  |  |
Balance, beginning of period at Dec. 31, 2018 | $ 424.2 | $ 37.7 | 3,916.7 | (3,060.2) | (186.1) | (283.9) |
Balance, beginning of period (in shares) at Dec. 31, 2018 | 292,611,569 | 292,600,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
NET INCOME (LOSS) | $ 229.6 |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ 18.3 |  |  |  |  |  |
Stock Repurchased During Period, Shares | (24,400,000) |  |  |  |  |  |
Common Share Repurchases, Value | $ (252.9) |  |  |  |  |  |
Balance, end of period at Sep. 30, 2019 | $ 359.9 | $ 37.7 | 3,867.7 | (2,889.0) | (390.9) | (265.6) |
Balance, end of period (in shares) at Sep. 30, 2019 | 270,075,445 | 270,100,000 |  |  |  |  |
Balance, end of period PY at Sep. 30, 2019 |  |  |  |  |  | (265.6) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
TOTAL COMPREHENSIVE LOSS | $ 247.9 |  |  |  |  |  |
Balance, beginning of period at Mar. 31, 2019 | 261.7 | $ 37.7 | 3,860.2 | (3,096.8) | (263.9) | (275.5) |
Balance, beginning of period (in shares) at Mar. 31, 2019 |  | 282,800,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
NET INCOME (LOSS) | 160.8 |  |  | 160.8 |  |  |
Other Comprehensive Income (Loss), Net of Tax | 3.7 |  |  |  |  | 3.7 |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 100,000 |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 4.6 |  | 3.4 |  | 1.2 |  |
Stock Repurchased During Period, Shares |  | (12,900,000) |  |  |  |  |
Common Share Repurchases, Value | (128.6) |  |  |  | (128.6) |  |
Dividends, Common Stock | (16.6) |  |  | (16.6) |  |  |
Balance, end of period at Jun. 30, 2019 | 285.6 | $ 37.7 | 3,863.6 | (2,952.6) | (391.3) | (271.8) |
Balance, end of period (in shares) at Jun. 30, 2019 |  | 270,000,000.0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
TOTAL COMPREHENSIVE LOSS | 164.5 |  |  |  |  |  |
NET INCOME (LOSS) | 90.9 |  |  | 90.9 |  |  |
Other Comprehensive Income (Loss), Net of Tax | 6.2 |  |  |  |  | 6.2 |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 100,000 |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | 4.5 |  | 4.1 |  | 0.4 |  |
Dividends, Common Stock | (27.3) |  |  | (27.3) |  |  |
Balance, end of period at Sep. 30, 2019 | $ 359.9 | $ 37.7 | $ 3,867.7 | $ (2,889.0) | $ (390.9) | (265.6) |
Balance, end of period (in shares) at Sep. 30, 2019 | 270,075,445 | 270,100,000 |  |  |  |  |
Balance, end of period PY at Sep. 30, 2019 |  |  |  |  |  | $ (265.6) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
TOTAL COMPREHENSIVE LOSS | $ 97.1 |  |  |  |  |  |

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