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Debt (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Feb. 28, 2018 | Feb. 09, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Tender Offer | $ 985.0 |  |  | $ 985.0 |  |  |  |
Aggregate Principal Amount Repurchased | $ 721.8 |  |  | 721.8 |  |  |  |
Loss (gain) on debt extinguishment |  | $ (19.0) |  | $ (19.0) | $ (2.6) |  |  |
Quarterly cash dividends (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.02 | $ 0.02 |  |  |
7.75% Senior notes due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 7.75% |  |  | 7.75% |  |  |  | 7.75%
8.50% senior notes due 2019 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 8.50% |  |  | 8.50% |  |  |  |
Aggregate Principal Amount Repurchased | $ 237.6 |  |  | $ 237.6 |  |  |  |
6.875% Senior notes due 2020(2) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 6.875% |  |  | 6.875% |  |  |  | 6.875%
Aggregate Principal Amount Repurchased | $ 328.0 |  |  | $ 328.0 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 122.9 |  |  | $ 122.9 |  |  |  |
4.70% Senior notes due 2021(2) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.70% |  |  | 4.70% |  |  |  | 4.70%
Aggregate Principal Amount Repurchased | $ 156.2 |  |  | $ 156.2 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 113.5 |  |  | 113.5 |  |  |  |
Five Year Credit Facility | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current borrowing capacity | 2,000.0 |  |  | 2,000.0 |  |  |  |
Maximum borrowing capacity | 1,500.0 |  |  | $ 1,500.0 |  |  |  |
Commitment fee percentage |  |  |  | 0.75% |  |  |  |
Maximum percent of debt to total capitalization ratio |  | 60.00% |  |  |  |  |  |
Additional secured debt, value |  |  |  | $ 750.0 |  |  |  |
Additional secured debt, percent of tangible net worth |  |  |  | 10.00% |  |  |  |
Quarterly cash dividends (in dollars per share) |  |  |  | $ 0.01 |  |  |  |
Aggregate amount of available cash | 150.0 |  |  | $ 150.0 |  |  |  |
Fair value of amount outstanding | 0.0 |  |  | $ 0.0 |  |  |  |
Five Year Credit Facility | Revolving Credit Facility [Member] | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 3.00% |  |  |  |
Five Year Credit Facility | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 4.00% |  |  |  |
Credit Facility due 2020 | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current borrowing capacity | 1,300.0 |  |  | $ 1,300.0 |  |  |  |
Credit Facility due 2022 | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current borrowing capacity | 1,200.0 |  |  | $ 1,200.0 |  |  |  |
Period for repayment of acquired companies |  |  |  | 90 days |  |  |  |
Aggregate amount of available cash, after repayments | 250.0 |  |  | $ 250.0 |  |  |  |
Senior Notes | 7.75% Senior notes due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 1,000.0 |  |  | $ 1,000.0 |  |  |  |
Debt instrument interest rate stated percentage | 7.75% |  |  | 7.75% |  |  |  |
Senior Notes | 8.50% senior notes due 2019 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 8.50% |  |  | 8.50% |  |  |  |
Aggregate Principal Amount Repurchased |  |  |  |  |  | $ 55.0 | $ 182.6 |
Senior Notes | 6.875% Senior notes due 2020(2) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 6.875% |  |  | 6.875% |  |  |  |
Aggregate Principal Amount Repurchased |  |  |  |  |  | $ 71.4 | $ 256.6 |
Senior Notes | 4.70% Senior notes due 2021(2) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.70% |  |  | 4.70% |  |  |  |
Senior Notes | Senior Notes | 4.70% Senior notes due 2021(2) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate Principal Amount Repurchased | $ 156.2 |  |  | $ 156.2 |  |  |  |

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