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Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock | Common Stock Cumulative Effect, Period of Adoption, Adjustment | Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance | Restricted Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Stockholders' Equity Attributable to Parent | $ 2,013.9 | $ (24.1) | $ 1,989.8 | $ 1,049.3 | $ 0.0 | $ 1,049.3 | $ 953.6 | $ (24.1) | $ 929.5 | $ (11.0) | $ 0.0 | $ 11.0 |
Net income | 161.2 |  |  | 0.0 |  |  | 161.2 |  |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ 45.6 |  |  | 0.0 |  |  | 0.0 |  |  | 45.6 |  |  |
Stock Repurchased and Retired During Period, Shares | 3,578,743 |  |  |  |  |  |  |  |  |  |  |  |
Common shares purchased and retired | $ (116.8) |  |  | (116.8) |  |  | 0.0 |  |  | 0.0 |  |  |
Stock issued during period, new issues (in shares) | 19,491 |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, RSU (in shares) | 332,085 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  |
Non-vested common shares forfeited or canceled | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  |
Stock compensation expense | 1.1 |  |  | 1.1 |  |  | 0.0 |  |  | 0.0 |  |  |
Stock compensation expense | 7.5 |  |  | 7.5 |  |  | 0.0 |  |  | 0.0 |  |  | $ 7.5
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition | $ (128.6) |  |  | 0.0 |  |  | (128.6) |  |  | 0.0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares | 34,912 |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 2.00 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 111,539 |  |  |  |  |  |  |  |  |  |  |  |
Shares tendered in payment of option price and income tax withholding amounts, shares | 26,124 |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 1,959.8 |  |  | 941.1 |  |  | 962.1 |  |  | (56.6) |  |  |
Common Stock, Value, Issued | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  |
Net income | 192.1 |  |  | 0.0 |  |  | 192.1 |  |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ (67.6) |  |  | 0.0 |  |  | 0.0 |  |  | (67.6) |  |  |
Stock Repurchased and Retired During Period, Shares | 128,171 |  |  |  |  |  |  |  |  |  |  |  |
Common shares purchased and retired | $ (5.4) |  |  | (5.4) |  |  | 0.0 |  |  | 0.0 |  |  |
Stock issued during period, new issues (in shares) | 19,081 |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, RSU (in shares) | 241,307 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  |
Non-vested common shares forfeited or canceled | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  |
Stock compensation expense | 0.4 |  |  | 0.4 |  |  | 0.0 |  |  | 0.0 |  |  |
Stock compensation expense | 8.9 |  |  | 8.9 |  |  | 0.0 |  |  | 0.0 |  |  | 8.9
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition | $ (101.6) |  |  | 0.0 |  |  | (101.6) |  |  | 0.0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares | 73,044 |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 1.64 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 45,484 |  |  |  |  |  |  |  |  |  |  |  |
Shares tendered in payment of option price and income tax withholding amounts, shares | 6,982 |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 1,986.6 |  |  | 945.0 |  |  | 1,052.6 |  |  | (11.0) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (11.0) |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Value, Issued | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  |
Net income | 202.2 |  |  | 0.0 |  |  | 202.2 |  |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ (466.1) |  |  | 0.0 |  |  | 0.0 |  |  | (466.1) |  |  |
Stock Repurchased and Retired During Period, Shares | 5,040,896 |  |  |  |  |  |  |  |  |  |  |  |
Common shares purchased and retired | $ (199.0) |  |  | (199.0) |  |  | 0.0 |  |  | 0.0 |  |  |
Stock issued during period, new issues (in shares) | 46,913,370 |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, RSU (in shares) | 458,177 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 1,722.5 |  |  | 1,722.5 |  |  | 0.0 |  |  | 0.0 |  |  |
Non-vested common shares forfeited or canceled | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  |  |
Stock compensation expense | 0.1 |  |  | 0.1 |  |  | 0.0 |  |  | 0.0 |  |  |
Stock compensation expense | 9.6 |  |  | 9.6 |  |  | 0.0 |  |  | 0.0 |  |  | $ 9.6
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition | $ (182.1) |  |  | 0.0 |  |  | (182.1) |  |  | 0.0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares | 106,891 |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 1.70 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 17,807 |  |  |  |  |  |  |  |  |  |  |  |
Shares tendered in payment of option price and income tax withholding amounts, shares | 4,877 |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 3,073.8 |  |  | 2,478.2 |  |  | 1,072.7 |  |  | (477.1) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (477.1) |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Value, Issued | $ 0.0 |  |  | $ 0.0 |  |  | $ 0.0 |  |  | $ 0.0 |  |  |

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